The Armadillo Software Protection System Description:

Armadillo is a powerful software protection system. It wraps around your program like an armored shell, defending your work from pirates and program crackers with state-of-the-art encryption, data compression, and other security features. It allows you to design and add a complete software protection and registration-key system to your existing programs in five minutes or less, with no changes to your program's code! And it works with any language or tool that produces a 32-bit Windows EXE file.