Law term that means that some document, paper or deal has no power in law
Solution 1:
The phrase in UK/US law is null and void (see meaning 7).
null and void: without legal force or effect; not valid: This contract is null and void.
Solution 2:
It is as Matt said null and void, but only if at some point it were legally valid. If it never was valid, you would describe it as not legally binding.
Solution 3:
In Standards documents, you'll find the term "non-normative," referring to passages which are merely explanatory and not to be considered part of the requirements specified by the text.