Related Clues:

• Internet expert Lawrence Lessig's subject
• Secret payment at door for ecstasy
• Send a secret message to writer embracing fighting man with oriental
• Protect from a cyberattack, say
• Write, as computer programs
• What the four circled answers 'crack'
• Set of signals for sending messages
• Word with "bar" or "area"
• Symbolize, maybe
• The "C" in UPC
• Cracking target
• Cracking candidate
• Create a secret passage
• Word with "bar" or "dress"
• Semaphore signals, e.g