From WhyNotWiki

[edit] It's one thing to make use of proprietary formats; it's another to try to force people to use them, intentionally make it difficult to open your files using open software

— Tyler (2006-07-22 13:08)

http://www.boingboing.net/2005/08/29/howto_extract_video_.html

Unfortunately, Yahoo/Yahooligans requires that you have Microsoft or Real's proprietary browser plug-ins to watch the video, and takes countermeasures to prevent you from downloading the video to disk where you can watch it with an open player like mPlayer.

Boing Boing reader Owen Williams has taken the time to create a recipe for downloading the video anyway [...]