Keying

The word keying has a number of meanings:

keying (cryptography) is the installation of key material into a device.
keying (telecommunications) is a form of modulation where the modulating signal takes one of two values at all times. For example: "on" or "off", "mark" or "space". The name derives from the Morse code key used for telegraph signalling.
keying (graphics) is an informal term for compositing two full frame images together, by discriminating the visual information into values of color and light.

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