A license is either the transfer of a property right, in the case of an exclusive license, or the grant of some form of permission to do something that would otherwise violate the property right.
An assignment or exclusive license is the transfer of all or some of the property rights granted by copyright, and certain technicalities apply. First, to be legally effective, the transfer must be expressed in writing and be signed by the copyright owner.
A non-exclusive license is also familiarly known as a permission. Non-exclusive licenses can be granted far more casually than exclusive licenses because they do not involve the transfer of rights. Non-exclusive licenses do not have to be in writing, and indeed, the license can be implied by conduct.
A contract does not rely on an underlying property right but does require an agreement between two or more parties. They must agree to exchange something of value - even if that something is a promise to refrain from doing something.
Many copyright licenses are also contracts.
Open Licenses have two common features:
(1) they are granted to the public at large rather than to an identified person or group, and
(2) they are non-exclusive.
Creative Commons
these licenses are from the copyright owner to all members of the general public and the license is non-exclusive.
This info was paraphrased from Michael Carroll from content in the UMUC COPY601 course.
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