摘要:
Processing load on an executing device for conducting playback is high during the playback of contents since the executing device performs verification of the contents validity in parallel with the contents playback, and therefore the executing device has to be equipped with a highly efficient processor. The present invention reduces the processing load involved in the verification by using, for the verification, only a predetermined number of encrypted units selected randomly from multiple encrypted units constituting encrypted contents recorded on the DVD. In addition, the present invention is capable of improving the accuracy of detecting unauthorized contents to some extent by randomly selecting a predetermined number of encrypted units every time the verification is performed.
摘要:
A digital data copyright protection system especially for unencrypted data to protect a copyright thereof while charging a user appropriate royalties therefor. In the digital data copyright protection system, super distribution data is received by a super distribution data receiving unit (401) for storage in a super distribution data storage region (402). Right management information is acquired by an RMI acquiring unit (403) for storage in an RMI storage region (404). Unencrypted data is read by a data reading unit (406), encrypted by a data encrypting unit 408 with a key extracted by a content key extracting unit 405, and then is provided with the right management information in an RMI adding unit (409) for storage. Once the data is through with a purchase processing in a purchase processing unit (412), the data is decrypted by the content decrypting unit (414), and is played back by a reproduction control unit (415) and a speaker (416), or provided with an ID stored in a user ID storage region (418) by a distributor ID adding unit (411) for output.
摘要:
A reception apparatus includes a first timer and sends to a distribution apparatus a first date-time clocked by the first timer. The distributing apparatus includes a second timer, and generates expiry information based on a difference obtained by subtracting, from the first date-time, a second date-time that is clocked by the second timer. The expiry information is used to adjust a usage expiry date-time of a content. The reception apparatus judges whether playback of the content is permitted based on the first timer and the expiry information. With this arrangement, unauthorized use of the content beyond the expiry date-time is prevented.
摘要:
An optical disk includes an audio data storage area for storing audio data; a still picture data storage area for storing a plurality of pieces of still picture data; and a management area for storing reproduction control information for controlling reproduction of the audio data and the plurality of pieces of still picture data. The reproduction control information has flag information representing specified still picture data among the plurality of pieces of still picture data.
摘要:
Processing load on an executing device for conducting playback is high during the playback of contents since the executing device performs verification of the contents validity in parallel with the contents playback, and therefore the executing device has to be equipped with a highly efficient processor. The present invention reduces the processing load involved in the verification by using, for the verification, only a predetermined number of encrypted units selected randomly from multiple encrypted units constituting encrypted contents recorded on the DVD. In addition, the present invention is capable of improving the accuracy of detecting unauthorized contents to some extent by randomly selecting a predetermined number of encrypted units every time the verification is performed.
摘要:
There is provided a recording apparatus for recording first audio information (song 61) including a first audio content (65) in an information recording medium (55) which can store a plurality of audio contents (65,66) having a plurality of different audio properties, the information recording medium containing audio information (song 62) including a second audio content (66), wherein the recording apparatus includes: a conversion section for converting an audio property of soundless information (67) of the first audio information into the same audio property as the audio property of the second audio information; and a recording section for recording the soundless information (68) in the information recording medium as a part of the second audio information (song 64) so as to be adjacent to a tail of the second audio content, and recording thr first audio content in the information recording medium.
摘要:
An optical disk includes an audio data storage area for storing audio data; a still picture data storage area for storing a plurality of pieces of still picture data; and a management area for storing reproduction control information for controlling reproduction of the audio data and the plurality of pieces of still picture data. The reproduction control information has flag information representing specified still picture data among the plurality of pieces of still picture data.
摘要:
There is provided a recording apparatus for recording first audio information (song 61) including a first audio content (65) in an information recording medium (55) which can store a plurality of audio contents (65,66) having a plurality of different audio properties, the information recording medium containing audio information (song 62) including a second audio content (66), wherein the recording apparatus includes: a conversion section for converting an audio property of soundless information (67) of the first audio information into the same audio property as the audio property of the second audio information; and a recording section for recording the soundless information (68) in the information recording medium as a part of the second audio information (song 64) so as to be adjacent to a tail of the second audio content, and recording thr first audio content in the information recording medium.
摘要:
An optical disk includes an audio data storage area for storing audio data; a still picture data storage area for storing a plurality of pieces of still picture data; and a management area for storing reproduction control information for controlling reproduction of the audio data and the plurality of pieces of still picture data. The reproduction control information has flag information representing specified still picture data among the plurality of pieces of still picture data.