The author of RatDVD says: "There are three main reasons I have my own codec. First, I needed to store many of the original MPEG2 features to restore the original. Second, I had this idea that a real transcoder would be better than a decoder/encoder approach. Third,
H.264 and XviD (and other standard codecs)
are covered by a wide range of patents and patent pools and I wanted to keep the program completely free."
Hmmm...I thought H.264 and XviD were free...boh!
http://www.ratdvd.dk/faq.htm#codec