Just because a contract or licence agreement says something, it doesn't make it necessarily legal or enforceable. Personally I think that if I have bought something then I have the right to do with it more or less as I please.
But this of course is not a "thing" - it's a copyrighted work. Now of course you can put licence restrictions in place on copyrighted work - that is how the system works, more or less. Trying to restrict the rights of the purchaser is rather popular - particularly with American corporations.
The only way to actually *test* these licence restrictions is in the courts - and the extent to which the courts will side with the copyright holder rather than the purchaser depends largely on where those courts are.
For example, many software companies have tried to prevent the sale of "second-hand" software. Courts in the EU, particularly in Germany, have mostly sided with the consumer:
https://www.usedsoft.com/en/used-sof...gal-situation/
while in the US it tends to go the other way.