Jean-Marc Desperrier wrote:
> Kevin Wayne Williams wrote:
> 
>> [...]. This isn't a case of selling spark plugs on Sunday: real 
>> entities suffer real financial harm.
> 
> Left to be proven, entirely.

Pointer to academic reference about that :
http://www.theregister.co.uk/2004/03/30/kazaa_and_co_not_cause/
http://www.unc.edu/~cigar/papers/FileSharing_March2004.pdf