Sometimes spelled lisenser.
A person with exclusive legal rights over a thing or, acting as agent for the owner, gives, sells or otherwise surrenders to another a limited right to use that thing.
The person benefiting from the grant is called a licensee and the legal term used to describe the authority so given, a license.
The licensee receives very limited rights to the thing as set out in the license.
Generally, but subject to the terms of the license, a license is revocable on reasonable notice by the licensor to the licensee and usually does not give the licensee exclusive use of the thing.