DLOCK2 is a simple command line file encryption/decryption utility program that uses the free Diamond 2 Encryption Algorithm. Full source code and documentation of the algorithm are included. Version 2.01 is the same as the original DLOCK2, except recompiled for the Win32 command line and author contact information has been updated. The encryption key may be a passphrase on the command line or it may be contained in a file.