[Haskell-cafe] [Offtopic?] Cabal package license and copyright holder question

Hi all, I don't know if this is the right place to ask but, since it's somehow Haskell-related I decided to use haskell-cafe. I'm cabalizing a library which, apart from my own code, has code taken from others. As it could be expected, each piece has its own copyright holder and (slightly) different license. The concrete holder and licenses are clearly annotated in every module. But, even with that, I'm not sure if I'm entitled to set an overall copyright holder and license for the whole cabal package. So, right now, I'm not sure about what license and holder filelds should I set in my .cabal file. Could anyone who had encounterd this problem before suggest a solution? Thanks, Fons