[Air-l] music 'piracy' groups query

Dear all, I am researching the groups who 'rip' commercial CDs and vinyl for peer-to-peer distribution and wondered if anyone had come across any reading on this phenomena. The only article I have been able to find addressing this subject specifically is: Cooper, Jon, and Daniel Harrison. 2001. "The social organization of audio piracy on the Internet." *Media, Culture and Society* vol. 23, no. 1, pp. 71-89. Any suggestions as to material, especially on audio, or film 'rippers', or indeed software 'cracker' groups, would be very much appreciated. Best wishes, Andrew Whelan