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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 who was a college student at the time of the creation of the site. The site's tagline is "The Definitive DVD Backup Resource".
Started in March 2000, the site has expanded to contain a wide range of information on the subject of digital video encoding and DVD backup (or ripping). The most popular sections of the site were the guides to DVD ripping and the annual codec comparisons, where popular digital video codecs were compared on the basis of quality, speed, and compression. The forum is frequented by many developers of the tools and codecs featured on the site, such as FairUse4WM. The site has been criticized, as the techniques described by it can be used for copyright infringement, but it maintains that its guides should only be used for fair use. In some cases, users suspected of illegally copying media are refused help on the 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.
Due to the concentration of forum members who have technical backgrounds, there have been various software projects developed and maintained by forum members. These include:
- Media Player Classic Home Cinema, a lightweight media player using the DirectShow API
- ffdshow-tryouts, a collection of free software codecs, most notably libavcodec, provided as DirectShow filters
Doom9 members have also contributed significantly to various software projects, including:
- Ganesh, TS (23 April 2012). "Intel's Ivy Bridge: A HTPC Perspective". Anandtech. Retrieved 22 November 2017.
- Woodward, Matt (5 May 2003). "7 codec round-up at Doom9". Ars Technica. Retrieved 22 November 2017.
- "Cat and Mouse Copy Protection". Maximum PC: 27. May 2007. Retrieved 22 November 2017.
- Kirk, Jeremy (9 August 2007). "Hacker strips DRM from streaming Netflix movies". MacWorld. Retrieved 22 November 2017.
- Buechler, Georgios Diamantopoulos, Sohail Salehi, John (2005). Learning VirtualDub the complete guide to capturing, processing, and encoding digital video (1st ed.). Birmingham, UK: Packt Pub. ISBN 9781847190246.
- McMillian, Robert (29 December 2006). "Hacker: Blu-ray, HD DVD copy protection cracked". Info World. Retrieved 22 November 2017.
- REIMER, Jeremy (13 February 2007). "Crack in Blu-ray, HD DVD encryption gets wider". Ars Technica. Retrieved 22 November 2017.
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