JP2000196586A - Transport stream processing equipment - Google Patents

Abstract

(57) [Problem] A transport including encrypted data by suppressing an increase in the circuit scale and the required amount of a storage medium by performing efficient processing using device resources. Provided is a transport stream processing device capable of appropriately processing a stream. SOLUTION: In a PID table register 102, a correspondence relationship between a PID, ON / OFF information, and a descrambling key number is held, and in a descrambling key register, a correspondence relationship between a descrambling key number and a descrambling key is stored. By holding the transport packets, the transport packets included in the transport stream are processed based on these correspondences.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transport stream processing apparatus, and in particular, to a transport stream composed of transport packets and including data subjected to encryption processing, decryption corresponding to the encryption processing. The present invention relates to a transport stream processing device that performs a conversion process.

[0002]

2. Description of the Related Art With the advance of digitization and compression techniques of data, use of digital images and digital sounds for recording of images and sounds and transmission including broadcasting has been promoted. The merit of using digitized data for recording and transmission is that various types of data including images, sounds, characters, etc. can be handled in a unified manner, so that services can be integrated. By using compression technology for transmission and reception, it is possible to perform a large number of high-quality broadcasts by utilizing the limited transmission bandwidth, to be able to provide homogeneous service by using error correction technology, There are various advantages, such as that encryption technology can be easily used.

In transmitting and receiving such digitized data and compression-coded data, data is generally packetized. A packet is a unit of data obtained by dividing the entire data into a certain size. By transmitting and receiving data as packets, it is possible to increase the efficiency and accuracy of data communication. For example, in the case of performing packet switching in a computer network, each packet arrives at a destination at a different timing through the network and is reconstructed into the original data at the destination. Information for identifying the source, the order of the packets, and the like is added.

When digital data is handled, video (including still picture information), audio (including music information), character information, and additional information such as information on programs and services are used by using packetization technology. Various data are packetized and combined to form multiplexed data, and a transport stream (transport str
eam) can be recorded and transmitted.

[0005] A transport packet, which is a packet included in a transport stream, usually includes a header section containing information on packets such as packet types and control information, and a data section containing data such as video data and audio data. The header portion includes a PID (packet identifier) assigned as a unique number used for specifying a packet.

As described above, one of the great advantages in handling digital data is that the encryption technology can be easily applied. Also, in a system for broadcasting a program including video and audio, data of a plurality of programs can be packetized, multiplexed and transmitted as a transport stream, so that only a specific program among a plurality of programs is encrypted. It is also possible to transmit it in the form.

In a general system for transmitting encrypted data, a scramble (encryption) process of data is performed on a transmission side, and the encrypted data is transmitted.
On the receiving side, original data is obtained by performing descrambling (decryption) processing corresponding to the scramble processing on the transmitted encrypted data.
Scramble (encryption) is performed by converting ordinary data into encrypted data using a scramble key (encryption key) which is a specific bit sequence, and the corresponding descrambling process is performed by using a scramble key. It is often done by converting the encrypted data using the corresponding descramble key (decryption key) to obtain the original data.

As described above, when processing a transport stream in which encrypted data and non-encrypted data coexist, such as when only a specific program among a plurality of programs is encrypted and transmitted, a packet Identifier (PI
By using D), it is possible to specify a packet to be descrambled. In an apparatus for processing such a transport stream according to the prior art, the PID of a packet to be descrambled
And a descrambling key used for the descrambling process are set prior to the process, the PID and the descrambling key are held as a pair, and the process is performed in accordance therewith.

When a transport stream including encrypted data is input to such a conventional transport stream processing apparatus, the apparatus performs processing for each packet constituting the input transport stream. The PID of the packet is compared with the PID set to be descrambled. If the PIDs match, the descrambling process is performed on the packet using the set descrambling key.

[0010]

In the transport stream processing apparatus according to the prior art, as described above, the PID of the packet to be descrambled and the descrambling key used for the descrambling are set in advance. By doing so, it is possible to appropriately process a transport stream in which encrypted data and non-encrypted data coexist.

However, in such a conventional processing device, the PID of a packet to be processed and
Since the descrambling key used for the processing is always set as a pair, even if it is possible to perform processing using the same descrambling key for packets with different PIDs, It is necessary to hold the same descramble key, and there has been a problem that the device resources are not always sufficient in terms of utilization.

That is, although the appropriate number as the set number of PIDs and the appropriate number as the set number of descrambling keys do not always have the same value, the processing device according to the prior art always has the same value. Since the circuit configuration is set to the set value, there is a portion that performs an overlapping process, and there is a problem that the circuit scale tends to increase.

As described above, even when it is possible to process packets having different PIDs using the same descrambling key, it is necessary to hold the same descrambling key for each PID. Because the capacity of the storage medium used as the descrambling key register increases,
In particular, since the descrambling key generally has a large number of bits, a large amount of storage medium is used to hold the duplicated data, and there has been a problem that the apparatus resources are not used.

The present invention has been made in view of such circumstances, and suppresses an increase in the circuit scale and the required amount of a storage medium by performing efficient processing using device resources. It is an object of the present invention to provide a transport stream processing device that can appropriately process a transport stream including encrypted data.

[0015]

According to a first aspect of the present invention, there is provided a transport stream processing apparatus comprising a transport packet, the transport stream including encrypted data. In a transport stream processing device that performs a decryption process corresponding to the encryption process on the stream,
Packet decoding information holding means for holding packet identification information indicating a type of a transport packet included in the transport packet in association with packet decoding information as information relating to the decoding process; And a decryption process information holding means for storing the information and the decryption process information including the decryption key information used for the decryption process in association with each other.

According to a second aspect of the present invention, there is provided the transport stream processing apparatus according to the first aspect, wherein the packet decoding information holding means performs processing indicating whether or not decoding processing is necessary as the packet decoding information. Control information,
The decryption processing information holding means holds the decryption processing identification information used for identifying the decryption processing information, and the decryption processing information holding means holds the decryption processing identification information and the decryption key information. It is.

According to a third aspect of the present invention, in the transport stream processing apparatus according to the first aspect, the packet decoding information holding means is used as the packet decoding information for specifying the decoding processing information. The decryption process information holding unit stores the decryption process information and the decryption key information used for the decryption or that the decryption process is unnecessary. It holds the decoding processing information which is any of the information shown.

According to a fourth aspect of the present invention, there is provided the transport stream processing apparatus according to the first aspect, wherein the decoding processing information holding means includes one decoding processing specifying information and two or more decoding processing specifying information. The information is held in association with the information.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 The transport stream processing device according to the first embodiment of the present invention uses a PID indicating a packet type, information indicating whether descrambling processing is required or not for a packet of that type, and a descrambling process for a packet of that type. This information is stored in association with information specifying the descramble key to be used.

FIG. 1 is a block diagram showing the configuration of the transport stream processing apparatus according to the first embodiment. As illustrated, the transport stream processing device 100 according to the first embodiment includes a transport packet filter 101, a PID table register 102, a descrambler 103, a descramble key selection circuit 104, and a descramble key register 105. I have.

Transport packet filter 101
Retrieves and acquires information about a descrambling process stored in a PID table register 102 described later for each transport packet included in the input transport stream, and stores the acquired information about the descrambling process in a later-described manner. A descrambler 103
The data is output to the descramble key selection circuit 104. Also,
The transport packet to be processed is output to the descrambler 103.

The PID table register 102 holds packet descrambling information, which is information relating to descrambling processing, in association with the PID. The packet descramble information is a set of ON / OFF information and a descramble key number. The necessity / unnecessity of descrambling processing for a packet having a certain PID is as follows.
It can be known from the ON / OFF information in the packet descrambling information corresponding to the PID. The descrambling key number for acquiring the descrambling key used for processing the packet having a certain PID is the PI
It is obtained from the packet descrambling information corresponding to D.

That is, the PID table register 102
Are packet identification information (PID) indicating the type of transport packet, processing control information (ON / OFF information) indicating whether decryption (descrambling) processing is required, and decryption key information (descrambling key). It functions as packet decryption information holding means for storing packet decryption information (packet descrambling information) composed of decryption process specifying information (descrambling key number) used for the specification.

The descrambler 103 determines whether or not to perform descrambling processing on the transport packet input from the transport packet filter 101 in accordance with the input information. The descrambling process is performed using the descrambling key acquired from the key selection circuit 104 to generate a descrambled packet. The descrambled packet is output from the device output S160 of the processing device.
Becomes If the processing is not performed, the input transport packet is not descrambled,
This is the device output S160 of the processing device. That is, the descrambler 103 functions as a decoding unit that performs a decoding (descrambling) process on the transport packet using the decoding key information (descrambling key).

The descrambling key selection circuit 104 selects an appropriate key from the descrambling keys stored in the descrambling key register 105 based on the information input from the transport packet filter 101, and selects the selected key. The descramble key is output to the descrambler 103. The descrambling key register 105 holds the descrambling key in a pair with the descrambling key number. That is, the descrambling key register 105 stores the decoding process specifying information (descrambling key number) and the decoding key information (descrambling key) used for the decoding (descrambling) process in association with each other. Functions as processing information holding means.

FIG. 2 is a block diagram for explaining the functions of the transport packet filter 101 and the PID table register 102 included in the transport stream processing apparatus 100 according to the first embodiment. FIG. In the figure, the descrambler 103 and the descramble key selection circuit 10 shown in FIG.
4 and the descramble key register 105 are not shown.

In FIG. 2, a transport packet filter 101 includes a PID extraction / selection circuit 201, a PID
Comparison circuit 202 and descramble information selection circuit 2
03. The PID extraction / selection circuit 201 extracts a PID from a transport packet constituting the input transport stream, and outputs the extracted PID to the PID comparison circuit 202. PID comparison circuit 20
2 is the PID input from the PID extraction / selection circuit 201
The PID (processing target PID) is compared with a PID held in a PID table register 102 described later, and if the comparison results in a match, a signal indicating this is sent to the PID extraction / selection circuit 201 and the descrambling information selection. Circuit 20
3 and output. Descramble information selection circuit 203
Selects a packet descrambling information corresponding to the processing target PID when a signal indicating the match is input from the PID selection circuit 202, and selects the packet descrambling information included in the selected information.
The N / OFF information and the descrambling key number are obtained.
The PID table register 102 shown in FIG.
216 are stored.

FIG. 3 is a diagram for explaining a transport stream to be processed by the transport stream processing apparatus according to the first embodiment. FIG. 3A is a diagram illustrating a configuration of a transport stream transmitted in a transmission system using the processing device according to the first embodiment. As shown in the figure, the transport stream is composed of a plurality of transport packets, and one transport packet has a size of 188 bytes. FIG. 1B shows the structure of a transport packet. As described above, a packet includes a header portion and a data portion. Here, a 4-byte packet header is a header portion, and an 184-byte adaptation field / payload is a data portion. The header includes a PID, and the PID indicates an identification number of a program (program) in which the adaptation field / payload of the packet is used. In a transport packet including encrypted data, only the payload portion is scrambled.

The operation of the processing apparatus according to the first embodiment when processing the input transport stream will be described below. The transport stream processing apparatus according to the first embodiment having the configuration shown in FIGS. 1 and 2 processes a transport stream as shown in FIG. 3 in a digital broadcasting system conforming to a general MPEG system standard. However, as in the case of the processing device according to the related art, information necessary for processing is set before processing.

In the processing apparatus according to the first embodiment, in the PID register 102 shown in FIG. 1, for each PID included in the transport stream to be processed, the PID
ON / OFF information indicating the necessity / unnecessity of the descrambling process for the packet including the PID is set, and the descrambling key number for acquiring the descrambling key used for the descrambling process of the packet including the PID is set. . That is, for each program, whether the data packet included in the program has been encrypted (scrambled) or not, and a key number for obtaining a key required for descrambling corresponding to the encryption. Is set.

In the descrambling key register 105, information indicating the correspondence between the descrambling key number and the descrambling key is set. Therefore,
Unlike the processing device according to the prior art, the correspondence between the PID and the descrambling key is not maintained.
And the corresponding relationship between the descrambling key number and the descrambling key number and the descrambling key.

As shown in FIG. 1, a transport stream S15, which is a device input of the processing device of the first embodiment,
0 is input to the transport packet filter 101. The transport packet filter 101 performs the following processing for each transport packet included in the transport stream S150. The operation of the transport packet filter 101 will be described with reference to FIG.

First, the transport packet filter 1
01 extracts the PID included in the packet header of the transport packet to be processed and outputs this to the PID comparison circuit 202. The PID comparison circuit 202 compares the input processing target PID with the packet descrambling information for each PID stored in the PID table register 102.
The PIDs 11 to 216 are sequentially compared with each other, and a match is found. If the PID to be processed matches a PID included in any of the pairs with the descrambling information, the PID comparison circuit 202 outputs a signal indicating the match to the PID.
The data is output to the ID extraction / selection circuit 201 and the descramble information selection circuit 203.

When a signal indicating a match is input from the PID comparison circuit 202, the PID extraction / selection circuit 201 outputs the transport packet to the descrambler 103 shown in FIG. The descramble information selection circuit 203 receives the signal indicating the coincidence from the PID comparison circuit 202, and
Then, the packet descrambling information corresponding to the PID is acquired, and the ON / OFF information and the descrambling key number in the acquired packet descrambling information are obtained as shown in FIG.
To the descrambler 103 and the descramble key selection circuit 104 shown in FIG.

In the processing of the PID comparison circuit 202, if a matching PID is found and the above processing is performed, the PID extraction / selection circuit 201 performs the same processing on the next packet included in the transport stream S150. Is performed.

In FIG. 1, a transport packet and ON / OFF information are output from a transport packet filter 101 to a descrambler 103,
The operation after the descramble key number is output to the descramble key selection circuit 104 will be described. Descramble key selection circuit 10 to which the descramble key number is input
4 is held in the descramble key register 105,
By searching for the descramble key number, a descramble key corresponding to the descramble key number is obtained, and this is output to the descrambler 103.

The descrambler 103 sends the transport packet to be descrambled from the transport packet filter 101 to the ON / O
The FF information and the descramble key are input from the descramble key selection circuit 104. Then, the descrambler 103 processes the transport packet according to the input ON / OFF information. If the input ON / OFF information is “OFF” indicating that descrambling processing is unnecessary, the descrambler 103 outputs the transport packet without performing descrambling processing. The transport packet becomes the device output S160 of the processing device.

On the other hand, if the input ON / OFF information is “ON” indicating that the descrambling process is necessary, the descrambler 103 sends the transport packet to the The descrambling process is performed using the input descrambling key, and the data subjected to the descrambling process becomes the device output S160 of the transport stream processing device.

As described above, according to the transport stream processing apparatus of the first embodiment, the transport packet filter 101, the PID table register 102,
Descrambler 103, descramble key selection circuit 10
4 and a descramble key register 105,
The ID table register 102 holds the correspondence between PID and the necessity of descrambling and the correspondence between PID and the descrambling key number. The descrambling key register 105 stores the descrambling key number and the descrambling key. , And the transport packets included in the transport stream can be appropriately processed based on these correspondences.

Therefore, the processing is performed based on the correspondence between the PID and the descrambling key, so that the number of PIDs and the number of descrambling keys necessarily become the same. In comparison, the set numbers of the two can be set arbitrarily, so that there is no portion for performing the overlapping processing in the circuit configuration, and the circuit size can be reduced.

In the correspondence between PIDs and descrambling key numbers, the same descrambling key number can be set for a plurality of PIDs.
When it is possible to process the packet having D using the same descrambling key, a descrambling key number having a small data amount is set in place of a descrambling key having a large data amount. In addition, the setting can be performed easily and easily, and in addition, the capacity of the storage medium required for holding can be reduced as compared with the processing apparatus according to the related art.

Embodiment 2 The transport stream processing device according to the second embodiment of the present invention is similar to the transport stream processing device according to the first embodiment.
Performs the same processing as that of the first processing device, except that the state of holding information for the processing is different. FIG. 4 shows the second embodiment.
1 is a block diagram illustrating a configuration of a transport stream processing device of FIG. As shown, the transport stream processing device 400 according to the second embodiment includes a transport packet filter 401, a PID table register 4
02, a descrambler 403, a descramble key selection circuit 404, and a descramble key register 405.

As described above, the overall configuration of the transport stream processing apparatus according to the second embodiment is the same as that of the first embodiment, but the PID table register 402 and the descrambling key register 405 and 405 are different.

The PID table register 402 holds packet descrambling information, which is information regarding descrambling processing, as in the case of 102 in the first embodiment. The packet descrambling information is a set of a PID and a descrambling key number.
Unlike the case No. 2, it does not include ON / OFF information. Specific PID
The descrambling key number for acquiring the descrambling key used for the processing of the packet having is obtained from the packet descrambling information.

That is, the PID table register 402
Represents packet identification information (PID) indicating the type of a transport packet, and decryption processing specifying information (descrambling key number) used for specifying decryption processing information (descrambling key or descrambling OFF information). It functions as a packet decoding information holding unit that holds the packet decoding information in association.

The descrambling key register 405 holds the descrambling key or the descrambling OFF information in a pair with the descrambling key number. Therefore, in the processing device according to the second embodiment, the information indicating the necessity / non-necessity of the descrambling process for the transport packet is based on the descrambling key number rather than the information held by the descrambling key register 405. Will be obtained.

That is, the descrambling key register 40
5 is decryption process specific information (descramble key number)
And decryption processing information that is either decryption key information (descramble key) used for decryption (descrambling) processing or information (descrambling OFF information) indicating that decryption processing is unnecessary. Function as a decryption processing information holding unit that holds the information in association with.

The transport packet filter 401, descrambler 403, and descramble key selection circuit 404 shown in FIG. 4 are the same as those in the first embodiment (FIG. 1) except that a part of input / output information is different. Of 10
Similar to 1, 103, and 104. Also,
The transport packet filter 401 can have the same internal configuration as the first embodiment shown in FIG.

When the transport stream S450, which is the device input, is input to the transport stream processing device of the second embodiment thus configured,
The operation of the device will be described below. The transport stream S450 is similar to the transport stream S150 to be processed in the first embodiment, as shown in FIG. 3, includes a PID in a packet header, and has a payload portion of some transport packets. It has been scrambled.

Transport packet filter 401
Extracts the PID of the transport packet to be processed, searches the information held by the PID table register 402, and obtains the packet descramble information having the same PID. Transport packet filter 40
1 indicates that the transport packet is descrambler 403
Then, the descramble key number obtained from the PID table register 402 is output to the descramble key selection circuit 404.

The descramble key selection circuit 404 to which the descramble key number has been input searches the descramble key number held in the descramble key register 405 to find the descramble key corresponding to the descramble key number. , Or descramble OFF information, and outputs it to the descrambler 103.

When descrambler OFF information is input from the descramble key selection circuit 404, the descrambler 403 outputs this information without performing descrambling processing on the transport packet. The transport packet becomes the device output S460 of the processing device.

On the other hand, when the descrambler 403 receives the descramble key from the descramble key selection circuit 404, the descrambler performs a descrambling process on the transport packet by using the inputted descramble key. The data subjected to the descrambling process becomes the device output S460 of the transport stream processing device.

As described above, according to the transport stream processing apparatus of the second embodiment, the transport packet filter 401, the PID table register 402,
Descrambler 403, descramble key selection circuit 40
4, and a descramble key register 405,
The ID table register 402 holds the correspondence between the PID and the descrambling key number. The descrambling key register 405 stores the descrambling key number and information indicating the descrambling key or information indicating that descrambling is unnecessary. , And the transport packets included in the transport stream can be appropriately processed based on these correspondences. Therefore, similarly to the processing device of the first embodiment, it is possible to reduce the circuit scale, and the setting prior to the processing is flexible and easy, and the storage medium required for holding the descramble key is stored. Can be reduced.

Embodiment 3 The transport stream processing device according to the third embodiment of the present invention is similar to the transport stream processing device according to the second embodiment.
Is performed, but the state of holding the descramble key or information indicating that processing is unnecessary is different. FIG. 5 is a block diagram showing a configuration of the transport stream processing device according to the third embodiment. As shown
Transport stream processing device 5 of the third embodiment
00 is the transport packet filter 501, PI
It includes a D table register 502, a descrambler 503, a descramble key selection circuit 504, and a descramble key register 505.

As described above, the overall configuration of the transport stream processing device according to the third embodiment is the same as that of the second embodiment, but the transport packet filter 501 Part of the information output to the descramble key selection circuit 504 is different from the information held in the descramble key register 505.

Transport packet filter 501
Extracts the transport scramble control bit, which will be described later, from the transport packet to be processed, and outputs this to the descramble key selection circuit 504, in addition to the same processing as in the second embodiment. The descrambling key selection circuit 504 acquires the descrambling key or descrambling OFF information held in the descrambling key register 505 by using the transport scramble control bit in addition to the descrambling key number.

The descrambling key register 505 holds the descrambling key or the descrambling OFF information in association with the descrambling key number, as in the second embodiment. In the second embodiment, the correspondence between the descrambling key or the descrambling OFF information and the descrambling key number is one-to-one, but in the third embodiment, the correspondence is two-to-one. Become. As illustrated, in the descrambling key register 505 according to the third embodiment, one descrambling key number corresponds to two pieces of information, even information and odd information, and even information and odd information are Each is one descramble key or descramble OFF information.

FIG. 6 is a diagram showing a transport stream to be processed by the transport stream processing apparatus according to the third embodiment. As shown in the figure, this transport stream has the same format as the processing target of the processing device of the first or second embodiment shown in FIG. 3, but includes a transport scramble control bit in a packet header. . The transport scramble control bits are information on the descrambling process, and include “even”, “odd”, and “descramble OF”.
F ".

The operation of the apparatus of the third embodiment when a transport stream to be processed, which is an apparatus input, is input to the transport stream processing apparatus of the third embodiment having the configuration of FIG. 5 will be described below. I do. The transport packet filter 501 extracts a PID of a transport packet to be processed and a transport scramble control bit. And the extracted PID
, The information held by the PID table register 502 is searched to obtain packet descrambling information having a matching PID. The transport packet filter 501 filters the transport packet into the descrambler 5.
03, the extracted transport scramble control bit and the descramble key number obtained from the PID table register 502 are stored in the descramble key selection circuit 504.
Output to

When the transport scramble control bit and the descramble key number are input, the descramble key selection circuit 504 sends the descrambler OFF information to the descrambler 503 when the transport scramble control bit is “descramble OFF”. Output to On the other hand, when the transport scramble control bit is “even” or “odd”, even information or odd information corresponding to the descrambling key number is obtained and output to the descrambler 503.

When descrambling OFF information is input from the descrambling key selection circuit 504, the descrambler 503 outputs the descrambling OFF information without performing descrambling processing on the transport packet. The transport packet becomes the device output S550 of the processing device.

As described above, according to the transport stream processing apparatus of the third embodiment, the transport packet filter 501, the PID table register 502,
Descrambler 503, descramble key selection circuit 50
4 and a descrambling key register 505, and the descrambling key register 505 holds a one-to-many correspondence relationship between a descrambling key number and information indicating that descrambling key is unnecessary or descrambling is unnecessary. Based on the transport scramble control bits included in the transport packet, information indicating the necessity of descrambling processing and a descrambling key are obtained, and based on this, the transport packet included in the transport stream is obtained. Appropriate processing can be performed. Therefore, similarly to the processing device of the first embodiment, it is possible to reduce the circuit scale, and the setting prior to the processing is flexible and easy, and the storage medium required for holding the descramble key is stored. Can be reduced.

[0064]

According to the transport stream processing apparatus of the first aspect, a transport stream composed of transport packets and including data subjected to encryption processing is decrypted corresponding to the encryption processing. In a transport stream processing device that performs processing,
Packet decoding information holding means for holding packet identification information indicating a type of a transport packet included in the transport packet in association with packet decoding information as information relating to the decoding process; Information, and decoding processing information holding means for holding the decoding processing information including the decoding key information used for the decoding processing in association with each other, the correspondence relationship between the packet identification information and the packet decoding information, And appropriately processing the transport packets included in the transport stream based on the correspondence between the packet decoding information and the packet decoding processing information. Storage capacity required to hold the descramble key It is possible to reduce.

According to the transport stream processing apparatus of the second aspect, in the apparatus of the first aspect, the packet decoding information holding means includes, as the packet decoding information, processing control indicating whether or not decoding processing is necessary. Information, and decryption processing identification information used to identify the decryption processing information.The decryption processing information holding means stores the decryption key identification information and the decryption processing information. By holding the information, it becomes possible to perform an appropriate process using the device resources based on the held correspondence.

According to a third aspect of the present invention, in the device of the first aspect, the packet decoding information holding means includes a decoding unit which is used for specifying the decoding process information as the packet decoding information. The decryption process information holding means indicates the decryption process identification information and the decryption key information used for the decryption or that the decryption process is unnecessary. By holding the decoding processing information, which is one of the information, it is possible to perform appropriate processing by utilizing the device resources based on the held correspondence.

According to a fourth aspect of the present invention, in the device of the first aspect, the decoding process information holding means includes one decoding process specifying information and two or more decoding process specifying information. Since the information and the information are stored in association with each other, it is possible to perform an appropriate process using the device resources based on the stored correspondence.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a transport stream processing device according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing a detailed configuration of a part of the apparatus according to the embodiment;

FIG. 3 is a diagram showing a transport stream to be processed by the apparatus of the embodiment.

FIG. 4 is a block diagram illustrating a configuration of a transport stream processing device according to a second embodiment of the present invention.

FIG. 5 is a block diagram illustrating a configuration of a transport stream processing device according to a third embodiment of the present invention.

FIG. 6 is a diagram showing a transport stream to be processed by the apparatus according to the embodiment;

[Explanation of symbols]

101, 401, 501 Transport packet filter 102, 402, 502 PID table register 103, 403, 503 Descrambler 104, 404, 504 Descramble key selection circuit 105, 405, 505 Descramble key register 201 PID extraction / selection circuit 202 PID comparison circuit 203 Descramble information selection circuit 211, 212, 213, 214, 215, 216 PID, packet descramble information group

Claims (4)

[Claims] 1. A transport stream processing apparatus configured to perform a decryption process corresponding to the encryption process on a transport stream including data subjected to encryption process, the transport stream being configured by transport packets. Packet identification information indicating the type of transport packet included in the packet, and packet decoding information holding means for holding packet decoding information, which is information on the decoding process, in association with each other; A transport stream processing device comprising: a decryption process information holding unit configured to store the decryption process information including the decryption key information used in the decryption process in association with each other. 2. The transport stream processing apparatus according to claim 1, wherein said packet decoding information holding means includes, as said packet decoding information, processing control information indicating whether decoding processing is necessary or not, and said decoding control information. The decryption processing information holding means holds the decryption processing identification information and the decryption key information. A transport stream processing device characterized by the above-mentioned. 3. The transport stream processing device according to claim 1, wherein the packet decoding information holding unit includes decoding process specifying information used for specifying the decoding process information as the packet decoding information. The decryption processing information retaining means may include any one of the decryption processing identification information, the decryption key information used for the decryption, and the information indicating that the decryption processing is unnecessary. A transport stream processing apparatus for storing certain decoding processing information. 4. The transport stream processing apparatus according to claim 1, wherein the decoding process information holding unit associates one piece of the decoding process specifying information with two or more pieces of the decoding process information. A transport stream processing device, wherein the transport stream processing device stores the transport stream.