Proprietary software | KidzSearch. Family-friendly safe search for kids.

Proprietary software (or closed source software) does not let people see or change source code of the computer software. It is the opposite of free software. Proprietary software is usually created by businesses who want to sell their software, but some programs that are free to use are still proprietary because the user is not allowed to change them. With proprietary software, only the people that make the software can see and change the code.

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