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 people to use freely rather than being kept secret or restricted. In this excerpt, the technologies have been released to the open society, so “open society” is the closest choice. It does not specifically mean civilian researchers, mass media, or unlicensed users.

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