For months, there have been claims that Apple is trying to convince movie studios to include iPod-formatted versions of their films along with DVDs—one of several movie-related announcements expected at next week’s Macworld Expo. The idea has struck some as a disappointing cop-out, but it’s been forced upon Apple by U.S. laws that are presumed to permit CD ripping while opposing DVD ripping; consequently, to get a DVD on your iPod…