Topic summary
Licenses

Extracted from the Wikipedia article License.
Real property licenses
A license provides one party with the authority to act on another's land, when such action would typically amount to trespass absent that license. A key distinction between licenses and leases is that a license grants the licensee a revocable non-assignable privilege to act upon the land of the licensor, without granting any possessory interest in the land. Once a license is agreed upon, the licensee may occupy the land only so far as is necessary to complete the act. Another key distinction between a license and a lease is that leases are generally required to be in writing, where the statute of frauds requires it, while licenses can be made orally.