"You have undertaken to cheat me. I won't sue you, for the law is too slow. I'll ruin you."
- Cornelius Vanderbilt
My publisher, Morgan-Kaufmann, has people who issue take-down notices to the illegal sites with my books. I keep a "Google Alert" on my name (an advantage of a rare name) so I can notify the company lawyers.
But I find that it is faster to ask the site why they are committing a crime in person or by email. Most will co-operate.
I then find the poster and contact his school. Note to criminal masterminds -- don't post on Facebook, et al or use a school account. So far, I have gotten two crooks kicked out of universities in New Zealand. I also caught an instructor using some of my SQL PUZZLES for class assignments when one of his students sent me a "do my homework for me!" email.
I contact his employer (http://siia.net/piracy) and ask that they fire him. Here in Austin, the Software & Information Industry Association runs radio ads. Once they have probable cause for a warrant, a full software audit is easy to get.
Finally, I keep the name on a list in case I run into him in the database world. Vanderbilt was right. If he wants to cheat me out of my only retirement (want to see my 0.401 account?), I am quite happy to return the favor.
Marriage is the sole cause of divorce.