1.) DRM does not prevent a digital file from being copied
Moving on
2) It is impossible to prevent a digital file from being copied by its intended recipient. Not impractical, not difficult, but impossible
3) It is possible to make it difficult for the intended recipient of a digital file to copy it. However, that is offset by the fact that since distributing digital files is cost free, all it takes is one recipient willing to put in the effort to unlock the digital file. Contrast this with physical goods where every copy requires effort.
3) Therefore digital goods are not physical goods, and efforts to make them act like physical goods are simply going to engender giggles.
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