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MacTheRipper is a Mac OS X application that enables users to create a playable copy of the contents of a Video DVD by defeating the Content Scramble System. During this process it may optionally modify or disable the DVD region code or the User operation prohibition features of the copied data. The previous lack of an OS X equivalent to the PC software DVDShrink gave this standalone DVD ripper widespread popularity among Macintosh users.
The name is an allusion to Jack the Ripper.
The current public release is version 2.6.6. MacTheRipper was developed in 2002 and since that time, it has had over two million users. The latest release is v4.2.7, available for download from the MTR-4 forum, a forum only available after registering and getting approved by an administrator. Even documentation such as pricing (it's no longer free) and the FAQ is locked off.
The creation and distribution of MacTheRipper may violate the anti-circumvention laws which the U.S. and EU have adopted as part of the WIPO Copyright Treaty. In a case against the maker of a program similar to MacTheRipper, the court found that "the downstream uses of the software [...], whether legal or illegal, are not relevant to determining whether [the manufacturer] itself is violating the statute." In that case and others that followed it, the court found the software manufacturer in violation of the DMCA.
From version 3 and forward, MacTheRipper is sold for an undisclosed sum.