dvd copy protection strengthened dvds will be harder to copy thanks to new anti-piracy measures devised by copy protection firm macrovision.  the pirated dvd market is enormous because current copy protection was hacked more than five years ago. macrovision says its new ripguard technology will thwart most  but not all  of the current dvd ripping (copying) programs used to pirate dvds.  ripguard is designed to... reduce dvd ripping and the resulting supply of illegal peer to peer   said the firm. macrovision said the new technology will work in  nearly all  current dvd players when applied to the discs  but it did not specify how many machines could have a problem with ripguard. the new technology will be welcomed by hollywood film studios which are increasingly relying on revenue from dvd sales.  the film industry has stepped up efforts to fight dvd piracy in the last 12 months  taking legal action against websites which offer pirated copies of dvd movies for download.   ultimately  we see ripguard dvd... evolving beyond anti-piracy  and towards enablement of legitimate online transactions  interoperability in tomorrow s digital home  and the upcoming high-definition formats   said steve weinstein  executive vice president and general manager of macrovision s entertainment technologies group. macrovision said ripguard was designed to plug the  digital hole  that was created by so-called decss ripper software. it circumvents content scrambling system measures placed on dvds and let people make perfect digital copies of copyrighted dvds in minutes. those copies could then be burned onto a blank dvd or uploaded for exchange to a peer-to-peer network. macrovision said ripguard would also prevent against  rent  rip and return  - where people would rent a dvd  copy it and then return the original. ripguard is expected to be rolled out on dvds from the middle of 2005  the company said. the new system works specifically to block most ripping programs - if used  those programs will now most likely crash  the company said. macrovision has said that rip guard can be updated if hackers find a way around the new anti-copying measures.