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CODE is a medium-security general purpose encoder/decoder. Its
feature is not the encoding routine, but ease of use, and the use of
passwords. The encoding routine envolves a password. The encoded file
CANNOT be decoded without that password due to the way the file is
encoded. The password may be guessed, and a complex routine for
trial-and-error could figure out the password with a few days of CPU.
But for general use, CODE is safe. CODE flawlessly codes line-numbered
files and .EXE and .REL files. It uses the COMND JSYS for parsing in
standard TOPS-20 form (using ESC and editing control codes).