From <http://www.wired.com/news/news/technology/story/6947.html>:

Divx Protects Content, But Not Your Liberties The ability to create pristine copies of any digital work is seen as a threat by some Hollywood studios, which are experimenting with a new pay-to-play DVD format to protect their intellectual property. This format, Divx, could conceivably hobble the video rental business, but some see its real threat as an invasion of consumer privacy - and the freedom to view information anonymously.