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irrevocable, royalty-free, worldwide right and license

If words like that were used in said chess tournament, you probably would have to be 18 to compete.

They probably have to be 18 to grant irrevocable, royalty-free, worldwide right and license. But maybe they should have made it work somehow.

The way it's been explained to me before is that you do have to be an adult to enter in to a legal agreement.