Well we all know that DVD Shrink, one of the most popular open source DVD ripping programs, is no more. The program's development was halted and taken offline, although you can still find it around, if you look hard enough. ShrinkTo5 is the new, powerful and fast DVD copying engine on the block. ShrinkTo5 has been developed as a cross-platform engine available for free for anyone. It will even decrypt CSS if you have the appropriate .Dll file installed.
Check it out here, they are also working on Mac and Linux versions, which should be out soon.
Happy Ripping ;)