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A. Pase, M. Hermana, and F. Clarusty, “A Review of the Principle of Freedom of Contract and Copyright Protection: A Juridical Analysis of Constitutional Court Decision No. 63/PUU-XIX/2021 concerning Full Flat-Pay (Outright Sale) Agreements in the Music Industry”, jhs, vol. 12, no. 2, pp. 1057-1064, Oct. 2026.