[quote name='Earbrass' post='407751' date='Feb 12 2009, 04:49 PM']It's "licensed", because it's the past participle of the verb. 's' for the verb, 'c' for the noun. Same as practise/practice and many others. If you ever get confused, think of advice and advise, which nobody gets wrong because unlike the others they sound different.
So, if you are licensed to kill, for example, you have a licence to kill. A licensing authority issues licences. Just as if you are advised then you receive advice, and an advising body issues advice.
HTH.[/quote]
Grammatical advice in BC:FX. I like this!