closed source

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closed source

Proprietary software owned by one organization. The term is typically used only in discussions that contrast open source software with proprietary software. See open source and proprietary software.
References in periodicals archive ?
Yesser will hold workshops to review the outcomes of research and visits, as well as to present the Best Practices for Adoption and Use of Open-source Software Document and the List of Best Alternatives for Closed-source Software Document, in addition to the most remarkable success stories in the government sector in this area.
Studies about security in open-source software versus closed-source software show that closed-source software have fewer advisories but open-source software usually has less time between flaw discovery and a patch or fix.
You'll have to read the book and, finally, in what may serve as the epitaph of proprietary, closed-source software in the business world, Raymond notes that: "The brutal truth is this: when your key business processes are executed by opaque blocks of bits that you can't even see inside (let alone modify) you have lost control of your business [emphasis in original].