Otrkey

• Website: http://www.onlinetvrecorder.com/
• Samples: http://otr.datenkeller.at/ http://otr.dwolp.de/
• (public domain?) Decoder: http://pyropeter.github.com/otrtool/

.otrkey files are encrypted video files from the onlinetvrecorder website. the files are publically available, but require a key to decrypt them.

similar to wmv drm, it stores a key inside the file and requires a second key from the website.

A gpu brute force cracker may be able to decrypt such files.