The Difference Between Creating IP and Owning IP
When IP is registered, it is obvious who owns it. However, the IP typically created by and for your expertise-based business (e.g., the deliverables) is rarely registered.
So how do we know who owns what? That legalese in the back of your contracts and SOWs that you aren’t reading.
Here is a super simple cheat sheet, which addresses the ownership of copyrighted materials. Of course, there are exceptions and nuances to every rule, so consult a lawyer for your particular circumstance.