What do FairPlay Versions stand for?

Hello, everyone. I would like to know what do the FairPlay versions stand for or what do they mean, if they are something like just versions from a cryptographic algorithm. Also, I would like to have my mind very clear on this beacuse I have even thought of it having relation to media files such as movies, series or apps.
I thank you in advance for those who will spend a little time answering my question.

It refers to the versions of Apple's proprietary Digital Rights Management scheme, designed to prevent unauthorized usage of the files. 
The early versions were just for music, but nowadays it applies to video as well.

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