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Just publish all your findings and establish prior art and you should be ok. Or is there more to it?

How can you guarantee that the person publishing their findings won't change their mind later and apply for a patent?

In the US they have one year to file. In UK, EU, and most other countries public disclosure bars them from filing a patent application.

But there is no way to really be sure. Because they may have filed something before or after (within the 1 year) public disclosure.

Is there a way to waive that right?

Indeed, that could do it I think.