Some form of cryptography can be found nearly everywhere in computer technology. Popular standalone programs, like PGP and GPG, aid in securing communications. Web browsers and other programs implement cryptographic layers in their channels. Drivers and programs exist to secure files on disk and control access thereto. Some commercial programs use cryptographic mechanisms to limit where their installation and use may occur. Basically, every time you find a need to control the access and usage of computer programs or digital data, you'll find that cryptographic algorithms constitute important parts of the protocol for use of these programs/data.