Related Clues:

• They're sometimes cracked
• Crackers may be used on them
• The 'C' in U.P.C.
• A spy may crack it
• Computer programmers' expertise
• Bar ___
• Programmer's output
• Programmers' writing
• Word with bar or binary
• See 46-Down
• Something to break
• Cipher
• Secret stuff
• Body of laws
• Software developer output