Jisho

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権利の所在が不明な著作物
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Wikipedia definition
1. Orphan works​An orphan work is a copyrighted work for which the copyright owner cannot be contacted. In some cases the name of the creator or copyright owner of an orphan work may be known but other than the name no information can be established. Reasons for a work to be orphan include that the copyright owner is unaware of their ownership or that the copyright owner has died or gone out of business (if a company) and it is not possible to establish to whom ownership of the copyright has passed.
Read “Orphan works” on English Wikipedia
Read “権利の所在が不明な著作物” on Japanese Wikipedia
Read “Orphan works” on DBpedia

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