Abstract: Opera, when it is created and published, is a complex work that can give rise to the publication of various types of “derivative products”. This paper examines those that are commercialized in the book trade: general or reduced scores, printed or handwritten scores, collections of printed or handwritten excerpts, added arias, profane or spiritual parodies, librettos and fragments. They can be sold wihtin distinct commercial circuits, each of which having its own regulations.
