Proprietary software

Proprietary software, as defined by the Free Software Foundation, means any
software that does not meet the Foundation's criteria for free software.
Proprietary means that some individual or company holds the exclusive
copyrights on a piece of software, at the same time denying other people the
access to the software's source code and the right to copy, modify and study
the software. See intellectual property.

The term "proprietary" means "privately owned and controlled". Hence
software can remain proprietary even when source code is made publicly
available, if control over use, distribution, or modification is retained
(e.g., the commercial version of SSH.) On the other hand, software is
considered non-proprietary once it is released with a license that would
permit others to "fork" the software and release their own modified versions
without onerous restrictions, even though the copyright may remain in the
hands of a single individual. At least in theory, control has been conceded.

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