Business Standard / New Delhi October 1, 2008, 0:09 IST One more round has started in the battle between drug patent holders and generics players with Swiss firm Hoffman-La Roche filing a patent infringement suit against Indian generics leader Cipla for launching a copy of its anti-infection drug Valcyte. This battle is likely to go on for a long time with periodic victories and defeats going either way. But there is likely to be no going back to the old days when drugs still under patent in the regulated markets could be freely copied in markets like India. On the other hand, global drug majors are unlikely to get away easily with their attempts to