JP2006107165A - Content copy management method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To move content to a hard disk again when the content is compressed and converted from a high image quality to a low image quality when moving the content from a large capacity recording medium such as a hard disk to a mobile recording medium having a small capacity. If you do, you cannot return to the original high image quality.
When moving content from a hard disk to a mobile recording medium, the content is not erased on the hard disk and remains in an unusable state, while the mobile recording medium stores the content in the hard disk. By recording key information for making the content available again, copyright protection is ensured, and when the content is moved from the mobile recording medium to the hard disk again, the original high-quality content is restored. To be able to.
[Selection] FIG.

Description

  The present invention relates to a content copy management method for copying digital data from a medium in which the digital data is recorded to another medium.

  In recent years, recording devices and recording media that digitally record image, audio, and video data have become widespread. Since such digital data can be copied many times while maintaining the original image quality and sound quality, there is a risk that the profits of the copyright holders, sales rights holders, etc. of the content may be infringed. For this reason, various mechanisms have been introduced to prevent illegal copying.

  For example, in terrestrial digital broadcasting and BS digital broadcasting, a copy-once function is introduced that allows the broadcast content to be recorded only once. Here, when various digital broadcasts are received and content with copy-once restrictions is recorded on the recording device, the content can be moved to another recording device using a function called “move”. ing.

  As described above, in the conventional content copy management method, it is allowed to move the copy-once restricted content only once. Therefore, the moved content cannot be moved again, and the content can only be played back. It is possible.

  As another copy management method, the content, the content ID, and the number of copy rights given to the user from the copyright holder are distributed to the user as the same number of virtual content files as the number of copy rights. In some cases, when a user copies content from a transfer source medium to a copy destination medium, the content ID and the content ID recorded on the copy destination medium are collated.

Specifically, when the content IDs do not match, the content is moved together with the content ID and the number of copy rights, and when the content IDs match, the content of the copy destination medium is copied without moving the content. The number of rights is increased, the virtual content file is moved, and the virtual content file of the source medium is deleted (see, for example, Patent Document 1).
JP 2002-358242 A

  However, if the move function described above is used, the content data recorded in the recording device at the movement source is erased, so that the copy-once material is recorded from the recording medium A (for example, HDD) with a smaller capacity than the recording medium A. When the recording medium A is compressed and moved to the medium B (for example, SD) by some method (for example, re-encoding compression or trans-encoding compression) and then returned to the recording medium A again, the image quality is deteriorated compared to the original content data. There is. For example, if the image quality is lowered and moved to a removable medium in order to view the content on the mobile device when going out, the content cannot be viewed again with the original high image quality, which is disadvantageous for the user.

  Also, when copying copyrighted content, if the number of copy rights is distributed as a virtual content file to a removable medium, the information of the virtual content file may be forged, which is disadvantageous for the copyright holder.

  The present invention has been made in view of this point, and an object of the present invention is to make it possible to move content while maintaining reusability of recorded high-quality content.

In the content copy management method according to the present invention, when copying the content recorded on the movement source recording medium to the movement destination recording medium, the content ID of the content, the copy control information, and the movement destination recording medium Recording the ID as a lending list on the source recording medium;
When the copy control information of the content is copy-once, when the content is copied from the source recording medium to the destination recording medium, the content recorded on the source recording medium is prohibited from being used. And encrypting the content using the encryption key of the destination recording medium,
When returning the content copied to the destination recording medium to the source recording medium, the content ID of the content and the ID of the destination recording medium are collated, and if the two match, the destination recording And a step of disabling use of the content of the medium and canceling the use prohibition state of the content of the source recording medium.

  Therefore, according to the present invention, when copying content with image quality degradation, an image quality list is learned and displayed so that the user can select the image quality without hesitation. In addition, when moving the copy-once content from the recording medium A to the recording medium B, the data on the recording medium A is not physically erased after the movement to the recording medium B, and the right to use the recording medium A is erased and recorded. At the same time as adding the usage right to the medium B, the rental information of the content is not recorded in the recording medium B but stored in the device, and the content of the recording medium A is used unless it matches the media key and content ID of the recording medium B. I tried to protect the rights of copyright holders.

  According to the content copy management method of the present invention, it is possible to perform move-back by managing the deterioration of the image quality of the content and managing the rental of the content. Furthermore, it is possible to protect the rights of the copyright holder and manage the copy-once content without impairing the user's convenience.

  For rented content, the content is not simply made unavailable on the device, but the address information is encrypted, making it difficult to analyze even if the media is removed from the device. Because not all data is re-encrypted, user operations are not interrupted.

  Furthermore, by creating and saving an image quality list, the user can select an image quality without hesitation when performing copy processing with recompression.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The following description of the preferred embodiments is merely exemplary in nature and is in no way intended to limit the invention, its application, or its application.

  The digital video or audio recording device according to the embodiment of the present invention lends (rents) the content of the medium A instead of deleting it when the copy once content is moved from the medium A to the medium B. That is, while the use of the content of the medium A is prohibited, by encrypting the address of the target content of the content management information of the medium A, the content rented to the medium B is returned to the medium A (move) It is set in a state in which neither playback nor movement is possible until it is backed up.

  FIG. 1 is an explanatory diagram showing a copy management method according to an embodiment of the present invention. Here, FIG. 1A shows that the copy once content CT is recorded on the medium A (for example, HDD).

  FIG. 1B shows a case where the content recorded on the medium A is moved (hereinafter referred to as “move”) to the medium B (for example, SD) from the state of FIG. In this case, the content is rented from the medium A to the medium B, so that content data that cannot be used remains on the medium A, while the content is recorded on the medium B.

  FIG. 1C shows a case where the content recorded on the medium B is moved to the medium A from the state of FIG. In this case, the use prohibition on the unusable content data remaining on the medium A is removed without moving the content data on the medium A, while the unusable content data remains on the medium B. . Note that the content data may be deleted.

  FIG. 1D shows a case where the content recorded on the medium B is moved to the medium C (for example, HDD) from the state of FIG. In this case, since the content recorded on the medium B is in an unusable state, the movement of the content to the medium C is prohibited, and the rights of the copyright holder can be protected.

  FIG. 2 shows a copy management method for making it possible to lend contents again. Here, FIG. 2A shows that the copy once content is recorded on the medium A (for example, HDD).

  FIG. 2B shows a case where the content recorded on the medium A is moved to the medium B (for example, SD) from the state of FIG. In this case, when the content is rented from the medium A to the medium B, content data that cannot be used remains on the medium A, while the content is recorded on the medium B.

  At this time, the content is moved to the medium B with the copy-once attribute, and the time for storing the content that remains on the medium A and cannot be used is set. If the content is not returned within the set time, the content is deleted or the rental management data is encrypted and moved together with the content.

  FIG. 2C shows a case where the content moved to the medium B is further moved to the medium C (for example, HDD) from the state of FIG. In this case, unusable content data remains on the medium B, while content is recorded on the medium C.

  Here, when the medium C that can be a parent capable of distributing content receives content having a copy-once attribute from the medium B, the time for storing the content that remains on the medium B and cannot be used is set and moved. If the content is not returned within the set time, the content on the medium B is deleted to protect the copyright. Alternatively, the rental management data is encrypted and moved together with the content.

  FIG. 2D shows a case where the content recorded on the medium C is moved to the medium B from the state of FIG. When the content of the medium B is made unusable without being deleted from the state of FIG. 2C, the unusable content data remaining on the medium B without moving the content data to the medium B While the use prohibition is lifted, content data that cannot be used remains on the medium C. Further, after the time set previously, the content of the medium C is deleted, or the rental management data of the device incorporating the medium C is encrypted and moved.

  FIG. 2E shows a case where the content recorded on the medium B is moved to the medium A from the state of FIG. In this case, the use prohibition of the unusable content data remaining in the medium A is removed without moving the content data to the medium A, while the unusable content remains in the medium B. Note that the content data may be deleted.

  When the above-described devices equipped with the media A to C or the media A to C themselves move the content, they mutually authenticate the copyright of the content using an authentication method defined by CPRM.

  Here, when the content is moved, the content ID is compared with the content ID described in the medium to which the content is moved. If the content ID does not match, the content ID and the copy attribute of the content are moved as a never copy. The original content is erased.

  In the case of a copy management method that prohibits lending (see FIG. 1), if it matches, the lending management information is created with the copy attribute set to “never copy”, and the copy management method that permits lending (see FIG. 2). The lending time limit is set in the lending management information with the copy attribute as copy once, or the lending management information is moved to the medium B together.

  Here, when moving the content, the authority to use the source content is lost, and the content is encrypted and transferred with the encryption key in the destination medium.

  FIG. 3 is a diagram illustrating a form when the user moves content. In FIG. 3, a DVR 1 (Digital Video Recorder) receives content accompanied by CGMS (copy generation management) information distributed from a broadcasting station via a TV broadcast wave (not shown) and records it on an HDD (or recordable DVD). can do.

  Content whose CGMS information has a copy-once attribute is encrypted in the DVR 1 and then recorded on the HDD. The recorded content can be moved to a recordable DVD or SD memory card, which is a removable medium, by changing the image quality via the DVR 1.

  In FIG. 3, PD is a mobile phone provided with a removable medium insertion port such as an SD memory card, and can play back the content moved to the removable medium.

  In the present invention, when content is copied and moved from the medium A to the medium B, the level of image quality is managed to assist the user's operation. FIG. 4 is an explanatory diagram showing a data structure for assisting the user in selecting an image quality by the copy management method of FIG. 1, and a device list for each device in which the DVR 1 shown in FIG. 3 is preset and stored at the time of shipment. An example table is shown. The device list may be created based on device authentication, past user input history, or past authentication history.

  The device list includes device manufacturer name, device name, reproducible compression method, reproducible resolution, reproducible bit rate, reproducible variable or fixed bit rate allocation type, image quality level, etc. as data It is out.

  FIG. 5 shows an example of the contents stored in the DVR 1 shown in FIG. 3 and the image quality list for each device. This device list data includes content name, device name, capacity, reproducible compression method, reproducible resolution, reproducible bit rate, reproducible variable or fixed bit rate allocation type, image quality level, and the like. .

  6 to 11 show processing for moving content from the medium A (for example, the HDD in the DVR 1 shown in FIG. 3) of the apparatus that recorded the broadcast wave to the medium B via the apparatus (for example, the DVR 1). .

  FIG. 6 is a flowchart showing an overall content movement process. As shown in FIG. 6, in step S600, a message as to whether to create an image quality list is displayed when the user executes the movement process. In step S601, it is determined whether the user creates an image quality list. If “NO” at step S601, the process branches to step S607, the previous image quality list is displayed at step S607, and the process proceeds to step S609.

  If the determination in step S601 is “YES”, the process branches to step S602, and a search is made in step S602 as to whether there is an externally connected device such as in IEEE1394.

  In step S603, it is searched whether or not the device name searched in step S602 exists in an image quality list stored in advance such as when the device is shipped. In step S604, it is determined whether the device name exists in the image quality list.

  If “YES” at step S604, the process branches to step S606, and an image quality list is created by connected device authentication at step S606, and the process proceeds to step S608.

If the determination in step S604 is “NO”, the process branches to step S605, and an image quality list is created by user input in step S605, and the process proceeds to step S608. The updated image quality list is displayed in step S608. indicate. In step S609, the capacity of the copy destination medium is confirmed, and copying is performed in step S610.

  FIG. 7 is a flowchart showing detailed processing of step S605 shown in FIG. As shown in FIG. 7, in step S700, the copy source device displays a compressible image quality list to assist the user's input. The user selects the name of the device (device 2) that browses the content moved in steps S701 to S707, the compression method that can be used, the resolution, the average bit rate, and whether the bit rate is fixed (CBR) or variable (VBR). Input the bit rate allocation, image quality level evaluated by the user, etc.

  In step S708, a message as to whether or not the input information may be confirmed is displayed. In step S709, it is determined whether or not the input information is confirmed.

  If the determination in step S709 is “NO”, the process branches to step S701 and the process is repeated. If “YES” in step S709, the process branches to step S710, and the information input in steps S701 to S707 is stored in the image quality list in step S710.

  FIG. 8 is a flowchart showing detailed processing for confirming the free space of the move destination medium in step S609 shown in FIG. As shown in FIG. 8, in step S800, the capacity (Capa1) of the content to be moved is calculated from the average bit rate, the resolution, and the time of the content.

  In step S801, the free space (Capa2) of the destination medium is acquired. In step S802, it is determined whether the capacity of Capa2 is larger than the capacity of Capa2.

  If “YES” at step S802, the process branches to step S806. If the determination in step S802 is “NO”, the process branches to step S803, an indication as to whether or not recompression is performed is output in step S803, and whether or not recompression is performed is determined in step S804.

  If the determination in step S804 is “NO”, the process branches to step S805, and in step S805, a message that the move cannot be performed is displayed and the user continues to be alerted. If “YES” at step S804, the process branches to step S806, and an image quality selection step is performed at step S806.

  FIG. 9 is a flowchart showing detailed processing of the step of selecting the image quality when the user performs the move in step S806 shown in FIG. As shown in FIG. 9, in step S900, an image quality list of the content of the move source is displayed.

  Next, in step S901, a device (device 2) that reproduces the content to be moved is selected, and in step S902, an image quality list usable by the device 2 is displayed. In steps S903 to S906, the user sets image quality parameters.

  In step S907, the recompressed capacity (Capa3) is calculated from the set parameters, and in step S908, it is determined whether Capa3 is smaller than the free capacity (Capa2) of the move destination medium.

  If the determination in step S908 is “NO”, the process branches to step S901 and the process is repeated again. If “YES” at step S908, the process branches to step S909, and if there is a setting in the image quality list that matches the set parameters at step S909, the image quality level is displayed and matches. If not, a preview is performed, and the user inputs an image quality level and displays the image quality level.

  Next, in step S910, it is determined whether to determine the image quality. If the determination in step S910 is “NO”, the process branches to step S901 and the process is repeated again. If “YES” in step S910, the process branches to step S911, and the set parameters are stored in the image quality list as a history in step S911.

  FIG. 10 is a flowchart showing the detailed processing of the step of performing the copy processing when the user performs the move in step S610 shown in FIG. Since a copy management method for copy-once content to a medium in which the destination medium B does not support copyright protection technology (for example, CPRM) will be described later, the following description will be given assuming that it corresponds to copyright protection.

  As shown in FIG. 10, in step S1000, the address management information of the content to be moved is stored in the device. Next, in step S1001, the use of the content to be moved in the table that manages the move source content is prohibited, and the address management information of the content is encrypted. Such encryption can be performed using, for example, a device-specific encryption key of the DVR 1 shown in FIG.

  Next, in step S1002, based on the information stored in step S1000, the content to be moved is copied while being encrypted using the media encryption key of medium B. At this stage, even if the user deliberately removes the medium B from the device, the content of the copy source is unavailable and the address of the content is encrypted. Even if you try to decipher it with other devices, it cannot be deciphered easily.

  In step S1003, a message is displayed as to whether to delete the content of the moving source medium. In step S1004, it is determined whether to delete the content at the move source. If “YES” at step S1004, the process branches to step S1005, where the content is deleted based on the address stored at step S1000, and the address management information is decrypted and restored.

  If the determination in step S1004 is “NO”, the process branches to step S1006, and a lending list is created in step S1006.

  FIG. 11 shows detailed processing when content once moved from the medium A (for example, HDD) of the device (for example, DVR 1 shown in FIG. 3) to the removable medium B (for example, SD) is moved back to the medium A. FIG.

  As shown in FIG. 11, in step S1100, the lending list created in step S1006 shown in FIG. 10 and the ID of the content moved to the removable medium are authenticated. As a result of this authentication, if the content has been moved from the device in the past, the subsequent processing is performed.

  In step S1101, the address management information of the target content recorded on the medium B is stored in the device. Next, in step S1102, the address management information of the medium B is encrypted using, for example, the unique encryption key of the medium B.

  In step S1103, the address management information of the medium A encrypted in step S1001 shown in FIG. 10 is decrypted. At this stage, even if the user deliberately removes the medium B from the device, the content of the moveback source is unavailable and the address information of the content is encrypted. Even if you try to decipher it with other devices, it cannot be deciphered easily.

  In step S1104, a message as to whether to delete the content stored in the medium B is displayed. In step S1105, it is determined whether to delete this content. If “YES” at step S1105, the process branches to step S1106, where the content of medium B is deleted and the address information of medium B is decrypted at step S1106.

  If the determination in step S1105 is “NO”, the process is terminated as it is, and the content attribute of the medium B remains unavailable.

  FIG. 13 is a block diagram showing the configuration of the recording / reproducing apparatus in the embodiment of the present invention. In FIG. 13, when a recording command is received from the UI unit (1302) via the system control unit (1303), the broadcast wave video / audio input signal (1300) determines the copyright of the content at the input unit (1304). , Compressed by the encoder unit (1305), and once stored in the buffer of the stream buffer unit (1306).

  The data stored in the stream buffer unit (1306) encrypts the content according to the copyright of the content, and is recorded on an internal recording medium (1309) such as an HDD for every fixed capacity.

  The system control unit (1303) creates a lending management table as shown in FIG. 12, and the contents are stored in a rewritable storage area in the apparatus for each title.

  When a playback command is received from the UI unit (1302) via the system control unit (1303), the content is read from the internal recording medium (1309) and stored once in the buffer of the stream buffer unit (1306).

  The data stored in the stream buffer unit (1306) decrypts the content according to the copyright, is decompressed by the decoder unit (1307) for each predetermined capacity, and is output by the output unit (1308) according to the copyright of the content. Rights information is set and output to the outside as a video / audio output signal (1301).

  Here, when acquiring the image quality information of the external device, information (for example, device name) of the external device is acquired as IEEE 1394 data (1313) from the IEEE 1394 unit (not shown) via the IEEE 1394 unit (1312). Then, for example, a device list as shown in FIG. 4 stored in the internal recording medium (1309) is collated with the system control unit (1303) to create an image quality list as shown in FIG. 5, for example.

  When copying, a lending management table as shown in FIG. 12 is created, and the contents of the internal recording medium (1309) are re-encrypted by the stream buffer unit (1306) and recorded on the external recording medium (1310). The recording reservation and content storage period are managed by the timer unit (1311).

  Here, in the recompression, the video / audio output signal (1301) output from the output unit (1308) by reproduction is used as the video / audio input signal (1300) to perform re-encode recording. Note that trans-encoding compression may be performed using the system control unit (1303).

  Next, a description will be given of a case where timer reservation recording is performed by a recording / playback apparatus having the content copy management method. First, a user sets a recording start time and a recording image quality at the time of recording reservation. Here, when timer recording reservation is performed, the free space of the recording medium and the space necessary for recording the reserved program are calculated, and if the free space is larger, the reservation is accepted.

  When the free capacity is smaller, the lending management information is referred to, and when there is a rented content, the capacity is added to the free capacity and compared with the capacity required for recording. Here, when the rented content is deleted and the recording capacity is sufficient, the user is urged to return the lent content.

  FIG. 14 is an explanatory diagram showing an example of a content encryption method. Normally, when encrypting content, an encryption key is generated using the media key and ID of the medium B on which the content is recorded. Here, the media key of another medium A is used instead of the medium B on which the content is recorded. An encryption key is generated using ID and ID. The content encrypted in this way cannot be used unless two media are simultaneously present in the device.

  In addition, since the contents of the medium B cannot be decrypted unless it is set with the medium A, the data of the medium B can be copied and backed up to the medium C, and only one combination can be used. While protecting the rights of the copyright holder, the user's right of private reproduction can be guaranteed.

  Furthermore, even when the medium B (for example, DVD-R) does not have an encryption key, the content can be encrypted using the encryption key of the medium A.

  As described above, according to the content copy management method of the embodiment of the present invention, it is possible to manage the copy-once content without losing the convenience of the user while protecting the rights of the copyright holder.

  For rented content, the content is not simply made unavailable on the device, but the address information is encrypted, making it difficult to analyze even if the media is removed from the device. Because not all data is re-encrypted, user operations are not interrupted.

  Furthermore, by creating and saving an image quality list, the user can select an image quality without hesitation when performing copy processing with recompression.

  According to the content copy management method of the present invention, even in the case of digital content copy management, even when a copy-once attribute content recorded with high image quality is moved and recorded on a removable medium with a small capacity at low image quality, the original high image quality is achieved. Since the recorded content is prohibited from being deleted without being deleted, and the content can be rented and managed, it is possible to move back, so that it is useful as an apparatus for recording and reproducing digital content.

It is explanatory drawing which shows the copy management method which concerns on embodiment of this invention. It is explanatory drawing which shows the copy management method for enabling content to be lent again. FIG. 3 is an explanatory diagram showing a copy form according to the copy management method of FIGS. 1 and 2; FIG. 3 is an explanatory diagram showing a data structure of an image quality list table for managing a reproducible image quality list of a device by the copy management method of FIGS. FIG. 3 is an explanatory diagram showing a data structure of an image quality list table for managing an image quality list by the copy management method of FIGS. 1 and 2; It is a flowchart for demonstrating the copy process by the copy management method concerning this invention. It is a flowchart for demonstrating the copy process by the copy management method concerning this invention. It is a flowchart for demonstrating the copy process by the copy management method concerning this invention. It is a flowchart for demonstrating the copy process by the copy management method concerning this invention. It is a flowchart for demonstrating the copy process by the copy management method concerning this invention. It is a flowchart for demonstrating the copy process by the copy management method concerning this invention. It is explanatory drawing which shows the data structure of the rental management table | surface which manages the rental history and content by the copy management method concerning this invention. It is a block diagram which shows the recording / reproducing apparatus which concerns on this invention. It is explanatory drawing which shows the method of content encryption based on this invention.

Explanation of symbols

CT content data RM removable media PD playback device

Claims (11)

When copying the content recorded on the movement source recording medium to the movement destination recording medium, the content source ID, copy control information, and ID of the movement destination recording medium are lent out as the lending list. Recording on a medium;
When the copy control information of the content is copy-once, when the content is copied from the source recording medium to the destination recording medium, the content recorded on the source recording medium is prohibited from being used. And encrypting the content using the encryption key of the destination recording medium,
When returning the content copied to the destination recording medium to the source recording medium, the content ID of the content and the ID of the destination recording medium are collated, and if the two match, the destination recording A content copy management method comprising: setting a content of a medium to a use-prohibited state and releasing the content-use prohibited state of the content of the source recording medium. The content copy management method according to claim 1,
Storing address information indicating the content of the content management information of the source recording medium when prohibiting the use of the content;
Encrypting the address information using an encryption key of the destination recording medium;
A copy management method for content, further comprising a step of copying by referring to the address information. In the content copy management method according to claim 2,
When releasing the content use prohibition state, the content ID recorded on the destination recording medium and the ID of the destination recording medium are collated with the information on the lending list, and these information match. Encrypting the content of the destination recording medium using the ID of the destination recording medium;
The content copy management method further comprising the step of decrypting the encrypted address information. The content copy management method according to claim 1,
Calculating the capacity and average bit rate of the content when copying the content recorded on the source recording medium to the destination recording medium;
Displaying the capacity and average bit rate of the content;
Calculating a free capacity of the destination recording medium;
Selecting a compression method of content when copying to the destination recording medium;
Selecting the bit rate of the content when copying to the destination recording medium;
A content copy management method, further comprising: recompressing the content of the source recording medium based on the selected compression method and bit rate. The content copy management method according to claim 1,
Setting a lending time limit when copying the content recorded on the source recording medium to the destination recording medium;
Deleting the use-prohibited content recorded on the movement source recording medium when the content is not returned to the movement source recording medium within the lending time. Copy management method. The content copy management method according to claim 1,
The content copy management method further comprising a step of encrypting and copying a lending list together with the content when copying the content recorded on the migration source recording medium to the migration destination recording medium. The content copy management method according to claim 1,
When recompressing the content of the source recording medium, the content capacity of the source recording medium, the average bit rate, and the bit rate based on a correlation table between the compression method and the bit rate in which superiority or inferiority of image quality is set in advance, Selecting an optimal compression method and bit rate from the free capacity of the destination recording medium;
And a step of recompressing the content based on the selected compression method and bit rate. The content copy management method according to claim 1,
When re-compressing the content of the source recording medium, inputting the name of another recording / playback device held by the user into the image quality list;
Storing a history of the compression method and bit rate selected by the user in a management table;
Organizing the history stored in the management table for each other recording / playback device used by the user;
A copy management method for content, further comprising the step of creating a table for managing the organized information. The content copy management method according to claim 1,
A step of acquiring a recording / reproducing apparatus in which the content of the source recording medium is stored, a name of another recording / reproducing apparatus connected by a cable capable of device authentication, a reproducible compression method, and a bit rate When,
A content copy management method further comprising the step of creating an image quality list for managing the acquired compression method and bit rate. The content copy management method according to claim 1,
When copying content having a copy once attribute recorded on the source recording medium to the destination recording medium, the content is encrypted using an encryption key of a recording medium different from the source and destination recording media. Steps,
The content copy management method further comprising: decrypting the content of the destination recording medium using an ID of a recording medium different from the source and destination recording media. The content copy management method according to claim 1,
Calculating the free capacity of a recording medium for recording the content when performing the scheduled recording of the content;
Calculating a capacity required to record the content;
Collating the capacity of content present in the lending list;
A content copy management method comprising: displaying a request for return to the user when it is necessary to delete content existing in the lending list.

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