If your looking for a guide to backup your DVD’s or transcode some video look no farther than Doom9

Doom9 is a website featuring information on digital audio and video manipulation, mostly video, and digital copyrights. It is also the forum username of the author of the page, an Austrian college student. The site’s tagline is “The Definitive DVD Backup Resource”.

Started in March 2000, the site has expanded to contain a plethora of information on the subject of digital video encoding and DVD backup (or ripping). The most popular sections of the site are the guides to DVD ripping and the annual codec comparisons, where popular digital video codecs are compared on the basis of quality, speed, and compression. The forum is frequented by many developers of the tools featured on the site, such as FairUse4WM. The site has been criticized, as the techniques described by it can be used for movie piracy, but it maintains that its guides should only be used for fair use. Even people suspected of pirating movies are refused help on the forums.

The VirtualDubMod project began after many modifications to VirtualDub were posted on the Doom9 forums.

Doom9 gained notoriety as a result of its involvement in the AACS encryption key controversy. The utility BackupHDDVD was first posted by a Doom9 poster using the alias muslix64. The earliest information on how to find title and volume keys was also first revealed on Doom9 forums, by other users. The key that set off the controversy was also first posted by a user using the name arnezami.