noun
orphan works
Copyright term for works whose copyright holder cannot be identified or located. Used in legal, library, and archival contexts.
孤児著作物の利用には、権利者を探すための相当な努力が必要とされる。
Using orphan works requires a diligent search for the rights holder.
Compound of 孤児 (orphan) and 著作物 (copyrighted work). A calque from English 'orphan work'.