I think that you are going to have to ask the organisation that issued it. Assuming it is specific for use in Northern Ireland during The Troubles, it presumably has at least 'Restricted' or some higher protective security wrapper on it? In which case you know the answer if you have obtained the document legally.
In the MOD, similar aide-memoires that explain protocols for armed conflict are covered under Joint Service Publication (JSP) 383 which does not appear to be a Restricted document.