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Wikipedia definition
1. Proprietary softwareProprietary software is computer software licensed under exclusive legal right of the copyright holder. The licensee is given the right to use the software under certain conditions, while restricted from other uses, such as modification, further distribution, or reverse engineering. Complementary terms include free software, licensed by the owner under more permissive terms, and public domain software, which is not subject to copyright and can be used for any purpose.
Read “Proprietary software” on English Wikipedia
Read “プロプライエタリ・ソフトウェア” on Japanese Wikipedia
Read “Proprietary software” on DBpedia

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