Encryption and National Security

Computer Encryption Software: A software engineer is assigned to write an encryption program, but such a program would be a threat to national security if distributed internationally.
Role Play Material from MIT's EECS Department: RSA encryption is legally prohibited from being incorporated into a communication system. In this scenario a programmer distributes such a system without proper registration.
Lem El-Zif Role Playing Scenario: A student writes a program which incorporates a patented algorithm. Then he distributes it freely through a bulletin board.