A closed source is any proprietary software licensed under the exclusive legal right of the copyright holder.
Proprietary software, also referred to as non-free software or closed-source software, is computer software for which the publisher of the software, or shares the software itself, limiting the freedom of use with the software that they lease. Open-source or free software is in opposition to this. Patent rights can occasionally be seen in non-free software.
The majority of software is protected by copyright, which together with contract law, patents, and trade secrets provides a legal foundation for its owner to impose exclusive rights.
Licensing agreement terms that violate contract law or copyright laws are not enforceable since license agreements do not supersede those laws. In order to bypass copyright restrictions like the first-sale doctrine, certain software is deliberately licensed rather than sold.
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