A site license is a type of software license and a legal agreement that allows users to run the software package simultaneously. The name originally derives from the practice of restricting the use of a particular piece of software by physical site rather than by, for instance, the number of copies in use. However, the term "site license" is now commonly used to describe licensing of software to a particular entity which is unrestricted by number, regardless of the physical locations where the software may be used.