Scramble key management unit, scramble key management information transmitting unit, method for scramble key output management, scramble key management program, license information management unit, license management information transmitting unit, method for license information output management, and license information management program

A scramble key output management method for managing an output of a scramble key for decoding an encrypted content to a content decoder which decodes the encrypted content, the method comprising steps of:

• a scramble key management information decoding step performed by a computer to decode scramble key management information in which the scramble key and individual authorization information are encrypted, the individual authorization information including authorization information for a plurality of the content decoders, wherein the authorization information for the plurality of content decoders includes a sequence of bits, wherein each bit is associated with a single one of the plurality of content decoders and the bits are arranged in a numerical order of decoder IDs of the plurality of content decoders to indicate presence or absence of authorization for each of the plurality of the content decoders to decode the encrypted content;
• an authorization information obtaining step for obtaining the authorization information for the content decoder of an output target from the individual authorization information decoded by the scramble key management information decoding device based on the decoder ID of the content decoder of the output target;
• an authorization status determining step for determining whether or not the content decoder is authorized to decode the encrypted content based on the authorization information obtained by the authorization information obtaining unit;
• and
• a key output step for outputting the scramble key to the content decoder of the output target if the content decoder is determined to be authorized to decode the encrypted content in the authorization status determining step.

A computer readable non-transitory recording medium which stores a scramble key management program which causes a computer managing an output of a scramble key for decoding an encrypted content to a content decoder which receives and decodes the encrypted content to function as:

• a scramble key management information decoding means for decoding scramble key management information in which the scramble key and individual authorization information are encrypted, the individual authorization information including authorization information for a plurality of the content decoders, wherein the authorization information for the plurality of the content decoders includes a sequence of bits, wherein each bit is associated with a single one of the plurality of content decoders and the bits are arranged in a numerical order of decoder IDs of the plurality of the content decoders to indicate presence or absence of authorization for each of the plurality of the content decoders to decode the encrypted content;
• an authorization information obtaining means for obtaining the authorization information for the content decoder of an output target from the individual authorization information decoded by the scramble key management information decoding means based on the decoder ID of the content decoder of the output target;
• and
• an authorization status determining means for determining whether or not the content decoder is authorized to decode the encrypted content based on the authorization information obtained by the authorization information obtaining means and outputting the scramble key to the content decoder of the output target if the content decoder is authorized to decode the encrypted content.

A license information management apparatus for managing an output of license information for displaying a content to a content obtaining device which receives and displays the content, comprising:

• a license management information decoding device which decodes license management information in which individual authorization information is encrypted, the individual authorization information including authorization information for a plurality of the content obtaining devices, wherein the authorization information for the plurality of the content obtaining devices includes a sequence of bits wherein each bit is associated with a single one of the plurality of the content obtaining devices and the bits are arranged in a numerical order of content obtaining device IDs of the plurality of the content obtaining devices to indicate presence or absence of authorization for each of the plurality of the content obtaining devices;
• an authorization information obtaining device which obtains the authorization information for the content obtaining device of an output target from the individual authorization information decoded by the license management information decoding device based on the receiver ID of the content obtaining device of the output target;
• and
• an authorization status determining device which determines whether or not the content obtaining device is authorized to display the content based on the authorization information obtained by the authorization information obtaining device, and outputs the license information to the content obtaining device of the output target if the content obtaining device is authorized to display the content.

License information management apparatus which manages an output of license information for displaying a content to a content obtaining device which receives and displays the content, comprising:

• a license management information decoding device which decodes license management information in which individual authorization information is encrypted, the individual authorization information including authorization information for a plurality of the content obtaining devices, wherein the authorization information for the plurality of the content obtaining devices includes a sequence of bits wherein each bit is associated with a single one of the plurality of the content obtaining devices and the bits are arranged in a numerical order of content obtaining device IDs of the plurality of content obtaining devices to indicate presence or absence of authorization for each of the plurality of the content obtaining devices to display the content;
• an authorization information obtaining device which obtains the authorization information for the content obtaining device of an output target from the individual authorization information decoded by the license management information decoding device based on the first receiver ID of the content obtaining device of the output target;
• a lock control information obtaining device that obtains lock control information associated with a second receiver ID for controlling a lock status which is either a status where the output of the license information to the content obtaining device is allowed or a status where the output of the license information to the content obtaining device is prohibited, the second receiver ID identifying a larger number of the content obtaining devices than the first receiver ID;
• a lock control device that controls the lock status based on the lock control information;
• and
• an authorization status determining device which determines whether or not the content obtaining device is authorized to display the content based on the authorization information obtained by the authorization information obtaining unit, and outputting the license information to the content obtaining device of the output target if the content obtaining device is authorized to display the content and the lock status is the status where the output of the license information is allowed.

A license information output management method for managing an output of license information for displaying a content to a content obtaining device for receiving and displaying the content, comprising steps of:

• a license management information decoding step performed by a computer to decode license management information in which individual authorization information is encrypted, the individual authorization information including authorization information for a plurality of the content obtaining devices, wherein the authorization information for the plurality of the content obtaining devices includes a sequence of bits, wherein each bit is associated with a single one of the plurality of the content obtaining devices and the bits are arranged in a numerical order of content obtaining device IDs of the plurality of the content obtaining devices to indicate presence or absence of authorization for each of the plurality of the content obtaining devices to display the content;
• an authorization information obtaining step for obtaining the authorization information for the content obtaining device of an output target which is decoded in the license management information decoding step based on the first receiver ID of the content obtaining device of the output target;
• an authorization status determining step for determining whether or not the content obtaining device is allowed to display the content based on the authorization information obtained in the authorization information obtaining step;
• a lock control information obtaining step for obtaining lock control information associated with a second receiver ID for controlling a lock status which is either a status where the output of the license information to the content obtaining device is allowed or a status where the output of the license information to the content obtaining device is prohibited, the second receiver ID identifying a larger number of the content obtaining devices than the first receiver ID;
• a lock control process step for controlling the lock status based on the lock control information obtained in the lock control information;
• and
• a license information output step for outputting the license information to the content obtaining device of the output target if the content obtaining device of the output target is determined to be allowed to display the content in the authorization status determining step and the lock status is the status where the output of the scramble key is allowed.

A computer readable non-transitory recording medium which stores a license information management program for managing an output of license information for displaying a content to a content obtaining device which receives and displays the content, the program causing a computer to function as:

• a license management information decoding device for decoding license management information in which individual authorization information is encrypted, the individual authorization information including authorization information for a plurality of the content obtaining devices, wherein the authorization information for the plurality of the content obtaining devices includes a sequence of bits, wherein each bit is associated with a single one of the plurality of the content obtaining devices and the bits are arranged in a numerical order of contend obtaining device IDs of the plurality of the content obtaining devices to indicate presence or absence of authorization for each of the plurality of the content obtaining devices to display the content;
• an authorization information obtaining device for obtaining the authorization information for the content obtaining device of an output target which is decoded in the license management information decoding step based on the first receiver ID of the content obtaining device of the output target;
• a lock control information obtaining device for obtaining lock control information associated with a second receiver ID for controlling a lock status which is either a status where the output of the license information to the content obtaining device is allowed or a status where the output of the license information to the content obtaining device is prohibited, the second receiver ID identifying a larger number of the content obtaining devices than the first receiver ID;
• a lock control device for controlling the lock status based on the lock control information;
• and
• an authorization status determining device for determining whether or not the content obtaining device is authorized to display the content based on the authorization information obtained by the authorization information obtaining device and outputting the license information to the content obtaining device of the output target if the content obtaining device is authorized to display the content and the lock status is the status where the output of the license information is allowed.