Possible Clues:

• Method of secret communication
• Pearl Jam "No ___"
• Encrypted Wiz Khalifa track, with "The"?
• Rules of behaviour one can understand if someone breaks
• Internet expert Lawrence Lessig's subject
• "The Da Vinci ___"
• It can't be understood until it's broken
• Programmer's concern
• It may be cracked by a spy
• Fish sauce -- at last there's a set of rules