The point is that it is impossible for a computer to reliably determine if your access to a copyrighted material is lawful or infringing. You can try to fake it

The point is that it is impossible for a computer to reliably determine if your access to a copyrighted material is lawful or infringing. You can try to fake it and pretend the computer has a way of knowing but you will unavoidably err either on the side of permitting infringing access or on the side of restricting lawful access or both. DRM errs on both sides by at the same time being ineffective at preventing unlawful duplication (it can bypassed and if it can't, then blocking the analog hole is physically impossible) and over-restricting lawful use (fair-use, different user hardware, etc.). Streaming services are the same. There is no way for software to encode the multitude of ever changing details of the abomination that is copyright law. The "Color" analogy is apt because, copyright law is to a computer like color is to a colorblind person. S/he can pretend to recognize colors based on context, brightness, contrast, etc. but s/he can not actually see color. (Yes, I know there are various degrees of color blindness. For the sake of the argument take an extreme case of colorblindness.) And to be fair, the law is so murky it is similarly hard for humans too.