What about proving ownership, on the balance of probabilities, to show tortuous damages in a court? Seems like a list of receipts that's somehow certified would be beneficial to that end?
Probably first we need legislation to make digital purchases resalable, and to require DRM free versions to be made available if a product is EOL-ed.
Companies world copyright against the populous who are [in a functioning democracy] the ones who give them the copyright in the first place.