Digora for Windows 2.5: The Ultimate Software for Dental Imaging Devices

So, after 6 months of hard work finally released my application. Today I found the first web site where people download it cracked, and I was wondering if any of you fellow programmers know how to react to such stuff?

digora for windows 2.5 download 32

edit: programming is what I do- so no question about whether or not continuing, just is that clients pay per project in real money, and I still don't know if indie development would pay at least for the time invested, and now with the cracked download I'm trying to evaluate what to do, and if there's way to react

The most elegant solution I've seen was putting text along the lines on "cracks, warez, keygens, torrent files, free downloads etc. harm the publisher of this software" in small text at the bottom of all your web pages. It games the PageRank and (hopefully) causes users searching to cheat you to be sent to your site.