since it is necessary to learn to play/study existing pieces before moving to original works.
Sorry, I don't agree with this law and it will be violated everywhere. Laws that are routinely violated aren't worth having.
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I just had a thought. These tabs notations are clean room reverse engineered implementations of the songs. We don't necessarily *know* how it was played, we are guessing based on the sound of the thing coupled with our experience with our instrument and providing notes on how to achieve an approximation of the same sound based on our experience with the instrument.
IOW, we don't have access to the source code of the song but we've reimplemented it based on our external observations of how it acts. Kind of muddies things a bit - yes?
Just a thought experiment.