A co-publishing agreement is an agreement in which two or more parties share in the publishing rights (composition rights) of a song. The most common example of this occurs when a songwriter enters into a publishing deal in exchange for splitting the Publisher’s Share of royalties. The rights can be assigned by the songwriter for a period of time with reversion rights or in perpetuity. Additionally, one of the music publishers will control the legal right to act as administrator of the co-owned copyrights. In order to collect their share of the Publisher’s Share of performance royalties, a songwriter would create a publishing entity that would be registered with their PRO as shareholder of their works.