DVD's are generally encrypted with a copy protection technology called CSS. The hacker/phreaker/cracker ezine 2600 published a link to a utility known as deCSS, which apparently unencrypts the DVD files to your hard drive.
A court ordererd 2600 to remove the link, in a move that some consider a violation of the 1st Amendment.
I don't know if the deCSS program is still out there, but it seems likely.