MEDIA PLAYER

摘要

Content is provided on a medium or is transmitted, for example streamed, with in­ built protection against unauthorised playback or copying. Video content data is provided in content blocks, each of which relates to a video frame and has a corresponding header. Some content clocks have a digital fingerprint interposed somewhere in the data comprising that content block. Thus, the amount of the data in the content block is increased by the addition of the digital fingerprint. Information identifying the length of the content block in the corresponding header is not altered. Some or all content blocks are obfuscated following the additional of the digital fingerprints. In a media player, de-obfuscation is performed, and digital fingerprints then removed before the resulting content blocks are decoded. Whilst listening to music streamed to a mobile terminal, a user can purchase the track currently being played. An automated extraction configuration module examines metadata stored on a DVD to determine the configuration of content data stored on it. Extraction configuration data from a memory area (17) is utilised by a DVD decryption and extraction module (18) to extract movie data from the DVD, which is written as AVI data to an intermediate format movie data area. A mobile format conversion module (19) converts movie data stored in the extracted movie data area (14) and provides a movie in mobile telephone consumable format in a mobile format movie data area (20). The data also includes two or more media players and a loader program. The mobile device is controlled to run the loader program initially. The program detects the relevant configuration of the mobile device and determines which of the media players to use to consume the movie content data. A portable data storage medium (60) includes non-volatile memory (62), and an interface (61) for connecting to an external device. It also includes a controller (63) which reads data out from the non-volatile memory. A security device (64) is connected between the controller and the memory.