Hi, We have developed a new, effective licensing control system for Android called DroidActivator. It's intended to block piracy and also gives you some interesting opportunities, as licensing your app with an annual renewal fee, apply a subscription model to sell features or contents, distribute and protect your app outside AndroidMarket, track custom events and more. It is an Open Source project licensed under LGPL. You can take a look at the Google Code Project Page and at the DroidActivator's web site Hope it can help the community! Have a nice day, The DroidActivator developers team.