The only free decryption program that is still being updated regularly to deal with new protection schemes as they come out is DVDFab HD Decrypter. It is the free section of DVDFab and will continue to function even after the 30 day trial of the main program expires. http://www.dvdfab.com/free.htm
DVDDecrypter and DVDShrink will work fine for any dvd that has simple CSS encryption, but for many newer movies you should use DVDFab HD Decrypter. You can then reduce the size of the movie with DVDShrink to fit a blank dvdr disk.
For conversion to avi or mpeg4, you should look at AutoGK, Xvid4PSP, or Handbrake. Fair Use Wizard will also work for this but you need to rip to ISO files to use that program and the free version is limited to 700mb output size. There are many other options, and you can find them by looking through the conversion programs listed at www.videohelp.com