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Activatar is an open source Product Key activation system designed to control software licenses.

The system generates unique Product Keys, with information about the software, and provides mechanisms to validate and activate the product, emitting a signed Product License.

The Product Keys are generated by the system with cryptic information that only the server can validate. After activation, the server emits a signed Product License valid only for the machine that activated the product.
Some of the features of Activatar are:

Product Key contains 6 bytes of information that can be used to identify the product name and version, product edition (standard, professional, etc.) and expiration day for a Trial version
Product License contains the same information plus the Product Key creation date and activation date
Product Activation is based on RSA asymmetric encryption (public/private pair key). Changing the key pair is like changing the Algorithm to hide The Secret
Product License contains a hashed value of several machine identifiers to avoid using same license in different computers
Information sent to the server is hashed, which cannot be used to identify anything from the client
Extensible and customizable
Created on Visual Studio 2010 for .Net 4.0