Hollywood has been watching the heavy-handed tactics of the recording industry as it attempts to put an end to illegal online file-swapping, and it can’t have failed to notice that that none of the hardball tactics have yet made a dent in the problem. So the Motion Picture Association of America is trying more of a good cop routine in its own battle against movie piracy. A new series of anti-piracy ads will begin running this week, with the message coming from set designers, craft people, and other lower-level movie types, rather than from studio execs, for whom consumers are unlikely to have a lot of sympathy.