The U on iTunes U - Terms

Codec

Codec is a device or program capable of performing encoding and decoding on a digital data stream or signal.

Codecs (in the modern, software sense) encode a stream or signal for transmission, storage or encryption and decode it for viewing or editing. Codecs are often used in videoconferencing and streaming media applications. A video camera's ADC converts its analog signals into digital signals, which are then passed through a video compressor for digital transmission or storage. A receiving device then runs the signal through a video decompressor, then a DAC for analog display. A "codec" is a generic name for a video conferencing unit.

Users of iTunes U will use codec to encrypt their information so people can download it and decode it to watch or listen to their information.

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