Scutex 

Scutex is a 100% managed .Net licensing system for use in managed standalone .Net based applications. Unlike most other .Net licensing solutions, Scutex provides 4 unique licensing schemes to meet the varying needs of business. These licensing schemes vary the amount of control that a company wishes to have on their licenses and how their end users will handle them.

There are two overall licensing schemes in Scutex, Static and Dynamic keys. Static keys are a fixed length and format, while dynamic keys are of variable length.