License is the verb; licence is the noun. 
My trusty, never dusty, Webster's says:  license n. 1. A legal permit to do something.  2.  A written or printed certificate of a legal permit.  3.  Unrestrained liberty of action; disregard of propriety.  4.  Allowable deviation from an established rule, form, or standard:  poetic license.  
v.t.  To grant a license to or for; authorize.
It does not list licence what-so-ever, and I have never seen this spelling before today!
Even our own wonderful spell check turned licence into license.