As my Android apps started becoming more popular, I started seeing piracy of my apps skyrocket. At the time, Google didn't have their application licensing system in place, so I built my own. With the licensing system in place for my apps, I was also free to distribute and sell my application binary on my own, without fear of it being pirated.

After seeing piracy drop dramatically and talking with other Android developers with the same problems, I decided to build a site around it and sell my system to other developers.

It took me about 2 weeks to build www.androidlicenser.com and I saw my first $40/month subscription within 5 days. It still brings in about $500/month consistently. Google has since come out with their own licensing system, but it suffers from the limitation of it only working for apps purchased through the Android Market which, in a world with many Android Markets, isn't good enough.