Content playback apparatus, content playback method, and program
    11.
    发明申请
    Content playback apparatus, content playback method, and program 有权
    内容播放装置,内容播放方法和程序

    公开(公告)号:US20050018854A1

    公开(公告)日:2005-01-27

    申请号:US10868872

    申请日:2004-06-17

    IPC分类号: G06F21/10 G11B20/00 H04N7/167

    摘要: A content playback apparatus prevents related content recorded on separate media that make up a virtual package from being played separately, thereby restricting playback of the content to only when the virtual package is assembled as intended by the creator, and protecting copyright of the content. A key obtaining unit obtains a second key, with use of key management information recorded on a recording medium on which related content relating to the encrypted content is also recorded. An information obtaining unit obtains the encrypted content and key generation information that relates to generation of the first key, from a source other than the recording medium. A key generation unit generates the first key with use of the second key and the obtained key generation information. A decryption unit decrypts the encrypted content with use of the first key.

    摘要翻译: 内容播放装置防止记录在构成虚拟包的单独媒体上的相关内容被单独播放,从而仅当虚拟包按照创作者的意图进行组合并且保护内容的版权时才限制内容的播放。 密钥获取单元使用记录在与记录与加密内容相关的相关内容的记录介质上的密钥管理信息来获得第二密钥。 信息获取单元从除了记录介质之外的源获得与生成第一密钥相关的加密内容和密钥生成信息。 密钥生成单元使用第二密钥和获得的密钥生成信息生成第一密钥。 解密单元利用第一密钥解密加密的内容。

    Distribution system, distribution apparatus, and reception apparatus for distributing contents having usage expiry
    13.
    发明授权
    Distribution system, distribution apparatus, and reception apparatus for distributing contents having usage expiry 有权
    用于分发具有使用期满的内容的分发系统,配送装置和接收装置

    公开(公告)号:US07386618B2

    公开(公告)日:2008-06-10

    申请号:US10431500

    申请日:2003-05-08

    IPC分类号: G06F15/16

    CPC分类号: G06F21/10 G06F2221/2137

    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 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.

    摘要翻译: 接收装置包括第一定时器,并且向配送装置发送由第一定时器计时的第一日期时间。 分发装置包括第二定时器,并且基于通过从第一日期时间减去由第二定时器计时的第二日期时间而获得的差产生到期信息。 过期信息用于调整内容的使用期限日期时间。 接收装置基于第一定时器和到期信息判断是否允许内容的回放。 通过这种安排,防止超出期满日期时间的内容的未经授权的使用。