On all of my DVDs the top and bottom lines of the film are cut.

Here's an example.

http://homepage.ntlworld.com/jonty_amiga/LineExample.JPG

This happens with all of my DVDs, when playing them with Power or WinDVD, decoded and played with Power or WinDVD, and encoded into a DivX or MPG.

Are they sopposed to be there?

Thanks in advance.