Cryptography law

technology to control access to software or digital content

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

a number that represents information which is illegal in some legal jurisdiction

attempts by MPAA and AACS-LA to prevent the distribution of a cryptographic key

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.

laws relating to encryption