How do you suggest getting around copyright issues? LIke Eric said - by posting pre-prints. I think this should be legal.
Note also these two clauses in the ACM Copyright Agreement: 1. "Copyright to the Work (...) is hereby transferred to the ACM (...) effective as of the date of this agreement" - which means that until you sign the agreement you can do whatever you want with your work, including posting it on arXiv. This does not help with any papers published in the past but I suppose it's worth noting for the future papers. 2. "Permitted Uses (...) Post the Accepted Version of the Work on (...) any repository legally mandated by an agency funding the research on which the Work is based." So if anyone manages to convice their university that they require all published papers to be posted to arXiv, then it will be legal to post the accepted versions of the paper on arXiv :-) Janek --- Politechnika Łódzka Lodz University of Technology Treść tej wiadomości zawiera informacje przeznaczone tylko dla adresata. Jeżeli nie jesteście Państwo jej adresatem, bądź otrzymaliście ją przez pomyłkę prosimy o powiadomienie o tym nadawcy oraz trwałe jej usunięcie. This email contains information intended solely for the use of the individual to whom it is addressed. If you are not the intended recipient or if you have received this message in error, please notify the sender and delete it from your system.