closed source

British  

noun

1. 1. intellectual property, esp computer source code, that is not made available to the general public by its creators

   2. ( as modifier ) Compare open source

      closed source software

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Example Sentences

He has criticized Microsoft-backed OpenAI, the firm behind chatbot sensation ChatGPT, of "training the AI to lie" and said OpenAI has now become a "closed source", "for-profit" organization that is "closely allied with Microsoft".

From Reuters

“And then I kind of took my eye off the ball, I guess, and they are now closed source and they are obviously for profit.”

From Washington Post

She claims it is one of the most effective tools to fight against China’s firewall, despite criticism from experts who warn that since Ultrasurf is closed source, there is no way to independently verify its performance or assure end users that they are not being tracked.

From New York Times

“Open source versus closed source, we don’t get hung up on those things,” Ms. Swett said.

From New York Times

Here, industry shifted from a single internal or closed source of research to multiple external or open sources18.

From Nature