In a lot of jurisdictions (California for instance) if you don't have any IP agreement then you are likely producing a "work for hire" that would mean the clien

In a lot of jurisdictions (California for instance) if you don't have any IP agreement then you are likely producing a "work for hire" that would mean the client owns everything (and you own nothing). So if you want to retain some ownership you will likely have to work out some (could be simple) IP agreement.