Some utilities like ZipGenius use a "CZIP" feature to create a secure, encrypted envelope for standard ZIP archives. 2. Slang & Idiomatic Use
Every file in a ZIP archive starts with a signature: 0x50 0x4B 0x03 0x04 . czit.zip
A section at the end of the file that lists all contents, starting with: 0x50 0x4B 0x01 0x02 . Some utilities like ZipGenius use a "CZIP" feature
It is considered informal and often rude, used to tell someone to keep a secret or stop being annoying. czit.zip