Indeed, the right to make copies are often licenced (although you can also sell that right) because it is explicitly written in some conventions (see https://en.wikipedia.org/wiki/Berne_Convention?useskin=vector) that the copyright resides with the creator to begin with. I don’t think the Berne Convention deals with the option of transferring intellectual property and the copyright to them, but I’m assuming it’s mostly defined well enough in some contract law or other.
Indeed, the right to make copies are often licenced (although you can also sell that right) because it is explicitly written in some conventions (see https://en.wikipedia.org/wiki/Berne_Convention?useskin=vector) that the copyright resides with the creator to begin with. I don’t think the Berne Convention deals with the option of transferring intellectual property and the copyright to them, but I’m assuming it’s mostly defined well enough in some contract law or other.