I think it's self-evident that a person should not be deprived of what they create without their consent. I'm not sure what you mean by "mutual agreement", but

I think it's self-evident that a person should not be deprived of what they create without their consent. I'm not sure what you mean by "mutual agreement", but I assume you don't mean that literally, as there would be no conflict and no need for any kind of ethical theory in a situation where everyone agrees.