OK,
A few months ago, I put up for sale a legitimate copy of Adobe CS4 on ebay. I received an email from someone requesting all various license #'s and certain other information on the box. It was late at night so I didn't feel like going thru all that, and when I went to respond the next day, I found the item had been removed due to an SIIA copyright infringement notice sent to ebay.
About a month ago, I got a letter from the SIIA counsel telling me I needed to pay $375 as a settlement for my copyright infringement. I emailed them back with exactly what had happened and let them know there was no copyright infringement that took place. I just got another email today as a "second warning". I have not sold any software on ebay since then, and in my opinion have done nothing wrong. Their entire case revolves around a non-reply to an email, and since I didn't reply within their arbitrary time limits, I must be selling counterfeit software. As far as I can tell this is a case of Argumentum ad Ignorantiam--I cannot disprove that what I was selling is illegal, therefore it must be illegal. I no longer have the software(I sold it on cragislist), so I am not able to give it to them for proof.
I refuse to pay them for not doing anything wrong. It is a matter of principle. What would be the likely outcome in a case like this if it went to court? I am in New York State.

