The one point that has basically been solved is NAT traversal. Thanks to Wire guard, Tailscale and the like. The relevant parts are open source and can be used basically as a library.
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I think it's about printers being required by law to (covertly) watermark copies as such, and make it somewhat traceable. This is supposedly to prevent duplication of protected works (books?) but also to prevent someone just using it to print money (badly, probably).
To my knowledge all major brands incorporate something like this.
Wikipedia article about the technology