I'd assume it should be legal for US residents to convert their purchased copy-protected DVDs into a portable format for their own use. But how about converting rented/borrowed from the library copy-protected DVDs into a portable format for on-the-go convenience of watching it on a ipod, zune etc.. while commuting, or other downtime. As long as the person still posesses the original rented DVD there shouldn't be legal problems, since after all he paid for it either directly for renting or through property taxes to the library. However he has to delete the file after returning the orginal DVD to avoid legal problems. What do you think ?