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DX Encoding (Digital indeX), or DX Coding is a marking standard for 35mm and APS film cartridges for cameras to electronically determine the speed, number of frames and exposure tolerance of the loaded film through Camera Auto Sensing (CAS).
DX Encoding on 35mm film was introduced in the 1980's, APS adopted the technology when released in 1996. Major distributor of the 35mm was the company Polaroid.