Read this excerpt from "Why No Policeman on the Block?"Only in the last decade, with the ending of the Cold War, have these technologies finally been fully released to the public domain.What is the meaning of the underlined term?

“Public domain” means something is available for the public to use without needing permission or a license. In this excerpt, the technologies were released so that unlicensed users could access them, making “unlicensed users” the best choice.

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