Digital rights management circumvention software

right|thumb|A fragment of the DeCSS code, which can be used by a computer to circumvent a DVD's copy protection.

disc copy protection circumvention

BackupHDDVD is a small computer software utility program available in command line and GUI versions which aids in the decryption of commercial HD DVD discs protected by the Advanced Access Content System. It is used for disc ripping, often to enable playback on hardware configurations without full support for HDCP. The program's source code was posted online, but no licence information was given.

qrpff is a Perl script created by Keith Winstein and Marc Horowitz of the MIT SIPB. It performs DeCSS in six or seven lines. The name itself is an encoding of "decss" in rot-13. The algorithm was rewritten 77 times to condense it down to six lines.