Original sentence: Complementary terms include public domain software, which is not subject to copyright and can be used for any purpose, and free software, licensed by the owner under more permissive terms.Many proponents of free and open source software including Richard Stallman use proprietary or non-free to describe software that doesn't meet their criteria for free or open source, though specific definitions vary.Proprietary software is computer software licensed under exclusive legal right of its owner.The purchaser, or licensee, is given the right to use the software under certain circumstances, but restricted from other uses, such as modification, further distribution, or reverse engineering
Edited sentence: A literal meaning of "proprietary" in relation to software is that it has a copyright owner who can exercise control over what users can do with the software, in contrast to public domain.A related term is "closed-source software" which usually describes software whose source code is not published, in contrast with "open source".However, the term is commonly used in a narrower sense to describe software with restrictions on use or private modification, or with restrictions judged to be excessive on copying or publishing of modified or unmodified versions.In this sense it is also known as "non-free software" and is the opposite of free software, generally speaking.Some kinds of software (such as shared source and "public source") are neither "closed-source" nor "open source" according to narrow definitions of those terms.Terminology for forms of software licensing is not fully standardized and can be controversial.The term proprietary software is often used to mean computer software which is neither free nor open source (as these terms are variously defined, especially by FOSS advocates such as the Free Software Foundation and the Open Source Initiative).These restrictions are placed on it by one of its proprietors.While most proprietary software is closed-source, source-available proprietary software also exists, such as LAME (which is open source but cannot be used legally without obtaining a license for a patented algorithm it contains)