United Nations Declaration on the Rights of Indigenous Peoples

Indigenous peoples have the right to maintain, protect and develop manifestations of their cultures, such as artefacts, designs, ceremonies, and technologies. States shall provide redress with respect to their cultural, intellectual, religious and spiritual property taken without their free, prior and informed consent or in violation of their laws, traditions and customs. Article 11 in this document may be a legal basis for potential lawsuits around Cultural Appropriation.

https://www.un.org/development/desa/indigenouspeoples/wp-content/uploads/sites/19/2018/11/UNDRIP_E_web.pdf