The Content Scramble System (CSS) was devised for this purpose to make copyright infringement difficult, but also presents obstacles to some legitimate uses of the media.
The association is also responsible for the controversial Regional Playback Control (RPC), the region encoding scheme which gives movie studios geographic control over DVD distribution.
As of 2001, members included film distributors such as Metro-Goldwyn-Mayer, Twentieth Century Fox and Warner Bros.[1][2] They filed the much publicized case versus Jon Johansen who they alleged wrote DeCSS.
It also removes Macrovision, CSS, region codes, and user operation prohibitions.
The injunction was eventually denied because CSS was no longer a secret by the time litigation occurred.