> What seems true is that both ipfs and blockchain technologies will make these legal tools obsolete.
I doubt it. More likely, it will make it easier to get yourself into hot water.
Committing a tort (in this case, violating the terms of a license agreement) is one thing, and, while lawyers might word their comments strongly, they're leaving you a very easy out here.
Committing a tort that can't be undone, but doing it on some sort of indelible public record, is probably just ensuring that you will get dragged into expensive legal proceedings. The current law still says that they have to defend their copyright in order to keep their copyright, so you won't really have left them with any other choice.