If it says "you may do something" it means you have permission. If it says "you may not do something" it means you are not permitted to do that. In other words, your forbidden to do that.
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SeraphinIf no permission would be granted, why wouldn't they just use "cannot" or "must not" instead?They could have used "cannot", but that is subject to the misinterpretation "you don't have the ability to ...".