DVD43 is an entirely free DVD decrypter.
When it decrypts your DVD, it runs in the background. DVD43 can decrypt (unlock) a DVD movie so that it can be read by your copy program.
The program does not require any particular knowledge, simply insert your DVD into the player and wait till it is detected (when the smiley becomes green), then launch your copy program to copy the movie.
DVD43 is compatible with Microsoft Windows Vista (32), Windows XP and Windows 2000.