So an AC2 server needs certain IP to work? You can license that IP as a product or publish the API and contracts, allowing third parties to emulate that IP.
Not all codebases have a clean separation between "own code" and "third-party code". If the AC2 devs licensed a commercial engine and then heavily modified it, the abandoned IP is still a derivative work of non-abandoned IP.
Not all codebases have a clean separation between "own code" and "third-party code". If the AC2 devs licensed a commercial engine and then heavily modified it, the abandoned IP is still a derivative work of non-abandoned IP.