In the present android market piracy became an issue where the developers lossing a lot of the revenue. Only one person is purchasing the application and at least 3 more users pirating it, which is a huge loss for Developers.
To avoid the piracy Android Licenser uses an "Activation Code" client-server licensing secheme.
For first 24 hours when the user trying to use the application, user must enter the activation code. Then the licensing server will checks in to ensure that a lilcense existing.if you want to know more about this,then you go to this below link..
