What should I do: My software was illegally resold
Someone recently told me he gave my program to a friend and asked if he would be able to register it (it was designed to a reg code is different each time its installed so that I can manually validate the purchase when its re-installed and to prevent illegal copies like this one).
I replied that I would not normally allow this, but I just changed the registration system that allows me to disable anyone's copy, so I said I'd allow the transfer on the condition that I disable his copy, he said ok so I disabled his copy and enabled the copy of who he gave it to.
I've recently found that that this was a lie, he had listed it on ebay for sale and it sold for about 2/3 the price I sell it for.
Should I do anything about that?
Things I could do:
-Disable the copy of the one that bought it
-Ask the one that sold it illegally to give the buyer his money back
-Leave a negative feedback on ebay to the one that bought it from me and resold it illegally
Should I do any of the above or just forget about this?