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The system is intended to prevent digital audio extraction ("ripping") from the protected discs, and thus limit the file sharing of ripped music. The techniques used are: The techniques used are: Multisession ( Blue Book ) information is included which effectively hides the audio tracks from most CD-ROM drives;
Also included may be the file's publisher, author, creation date, download date, and various notes. This information is not embedded in the content, as a watermark is. It is kept separate from the content, but within the file or stream. As an example, metadata is used in media purchased from iTunes for DRM-free as well as DRM-restricted content.
Copy protection for computer software, especially for games, has been a long cat-and-mouse struggle between publishers and crackers.These were (and are) programmers who defeated copy protection on software as a hobby, add their alias to the title screen, and then distribute the "cracked" product to the network of warez BBSes or Internet sites that specialized in distributing unauthorized ...
This can cause confusion, because digital rights management (DRM) technologies are typically associated with business-to-consumer systems designed to protect rich media such as music and video. IRM is a technology which allows for information (mostly in the form of documents) to be ‘remote controlled’.
Content Protection for Recordable Media and Pre-Recorded Media (CPRM / CPPM) is a mechanism for restricting the copying, moving, and deletion of digital media on a host device, such as a personal computer, or other player.
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Analog Copy Protection (ACP), the encryption technology created by Rovi Corporation (formerly Macrovision, now TiVo), is designed to thwart users' attempts to reproduce content via analog cables. When a DVD is played through an analog video cable and recorded using a VCR , Rovi's ACP technology will distort the copy partially or completely.
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