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.