I’m opening a bookshop that sells physical books. I have a machine that scans physical books and converts them into digital books. If a customer buys a physical book but wants to get a digital version for free, he can give me his physical book, which I store in my shop, and I can give him the digital version, but if the customer wants to get the physical version of his book, I have to take back his digital version. The only transaction the customer has to make is to buy the physical book, whereas nowadays, physical books are sold separately from their digital versions. Does my bookshop comply with the law?
There was this company doing something similar with CDs. They sold the physical medium and then let you download the ripped files and store the CDs at their place. In fact, you could just buy the record online and directly download a .flac from their website. And if you wanted, you could have the physical medium shipped to you.
Apparently that was legal, but they have gone bankrupt a few years ago iirc. They were called Murphies (idk about the spelling).