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    • 1. 发明申请
    • Partial encryption techniques for media data
    • 媒体数据的部分加密技术
    • US20070083467A1
    • 2007-04-12
    • US11247955
    • 2005-10-10
    • Aram LindahlMuthya GirishChristian Duvivier
    • Aram LindahlMuthya GirishChristian Duvivier
    • G06Q99/00
    • H04N7/1675G11B20/00086G11B20/00195G11B20/0021G11B20/0071G11B20/00855G11B20/10H04N21/23476H04N21/2541H04N21/4126H04N21/44055H04N21/835H04N21/84H04N21/85406
    • Improved techniques to partially encrypt media files are disclosed. The encryption serves to cryptographically secure only a portion of the media data within a media file, while the remaining portion of the media data is not cryptographically secured. Although only partial encryption is used, the portion being encrypted serves to substantially disrupt usefulness of other parts of the media file which are not encrypted. In other words, the partial encryption renders the media file substantially unusable by unauthorized users. In one embodiment, the partial encryption is performed by a host device and thereafter the partially encrypted media file is delivered to a client device. The client device, if authorized, can subsequently decrypt the partially encrypted media file and utilize (e.g., play) the media file. However, since the media files are only partially encrypted, the decryption is likewise also only partial, which makes decryption faster and less resource intensive.
    • 公开了改进的部分加密媒体文件的技术。 该加密用于在媒体文件中仅加密地保护媒体数据的一部分,而媒体数据的其余部分未被加密地保护。 虽然仅使用部分加密,但是被加密的部分用于基本上中断未加密的媒体文件的其他部分的有用性。 换句话说,部分加密使得媒体文件基本上不被用户授权。 在一个实施例中,部分加密由主机设备执行,此后将部分加密的媒体文件传送到客户端设备。 客户端设备(如果被授权)可随后解密部分加密的媒体文件并利用(例如,播放)媒体文件。 然而,由于媒体文件仅被部分加密,所以解密同样也只是部分加密,这使得解密更快,资源密集度更低。
    • 4. 发明申请
    • Efficient use of storage in encoding and decoding video data streams
    • 视频数据流的编码和解码有效利用存储
    • US20050286634A1
    • 2005-12-29
    • US11071901
    • 2005-03-01
    • Christian Duvivier
    • Christian Duvivier
    • H04N5/92H04N7/26H04N19/00H04N19/50H04B1/66H04N7/12H04N11/02H04N11/04
    • H04N19/00H04N19/174H04N19/176H04N19/42H04N19/423H04N19/426H04N19/433
    • Some embodiments facilitate encoding/decoding of a frame by organizing frame data in a storage structure in a novel manner. Specifically, in a portion of the storage structure allocated for a frame slice, used partition entries are stored in a first section of the allocated portion and unused partition entries are stored in a second section of the allocated portion, the first and second sections each comprising a continuous area of storage in the storage structure so that used partition entries are not interspersed with nonused partition entries. In some embodiments, additional data useful in the encoding or decoding of video data is determined and stored into the unused bytes of used partition entries (such as macroblock header data or canonical reference frame index data). In some embodiments, two or more identical partitions of a macroblock are coalesced into a single partition.
    • 一些实施例通过以新颖的方式组织存储结构中的帧数据来促进帧的编码/解码。 具体地,在分配给帧片的存储结构的一部分中,将所使用的分区条目存储在所分配部分的第一部分中,并且将未使用的分区条目存储在所分配部分的第二部分中,所述第一部分和第二部分包括 存储结构中的连续存储区域,使得所使用的分区条目不散布有未使用的分区条目。 在一些实施例中,确定视频数据的编码或解码中有用的附加数据并将其存储到所使用的分区条目的未使用字节中(诸如宏块头数据或规范参考帧索引数据)。 在一些实施例中,宏块的两个或多个相同的分区合并成单个分区。