The sad reality of DRM is that only rentals and subscriptions can honestly be done with it. You can guarantee access to a subscription library (Netflix, Xbox Game Pass, etc) for 30 days. You cannot guarantee access 30+ years in the future. And selling access like that is just a lie.

I do think if you are claiming something is not permanent you should basically have to make some specific claims about the timeliness of it (eg you can use it for at least 10 years or your money back).