Perforce is a commercial, proprietary, centralized revision control system.
Perforce is a commercial, proprietary, centralized revision control system provided by Perforce Software. It generally requires a connection from the clients to the appropriate server while the managed documents are being modified, and boasts such features as atomic commits and controlled access to the repository. Perforce Software provides a comparison to some other revision control systems (and a glossary of common terms on the same page).