Alice writes a poem and licenses it under any 3.0 Creative Commons license.
Bob copies the poem and publishes it on his blog (with correct attribution).
Alice is Original Author and Licensor. Is Bob a Licensor?
The definition says for all 3.0 licenses (e.g., CC BY 3.0):
"Licensor" means the individual, individuals, entity or entities that offer(s) the Work under the terms of this License.
How is "offer" meant here?
If Bob is not a Licensor, how could he become one?