A LITTLE TRICK TO SPOT LICENCE
Try using the word 'card' (or 'papers') instead of 'licence'. If the sentence still makes sense, then 'licence' is almost certainly correct.
(This trick works because 'licence' is a noun, just like the words 'card' and 'papers'.)
A LITTLE TRICK TO SPOT LICENSE
Try using the verb 'to allow' (in its various forms; e.g., allowing, allowed, allows) instead of 'license'. If the sentence still makes sense, then 'license' is almost certainly correct. However, if you find yourself using 'allowance' then you should be using 'licence', because both are nouns. (This trick works because 'to license' is a verb, just like 'to allow'.)
NO CONFUSION
There should be no confusion with licensing or licensed. The endings ing and ed mean these are always from the verb; i.e. there are no such words as licencing or licenced in British or American English.
There should be no confusion with licensing or licensed. The endings ing and ed mean these are always from the verb; i.e. there are no such words as licencing or licenced in British or American English.
LICENSE IN AMERICA
In American English, 'license' is both noun and verb.