Article snapshot taken from Wikipedia with creative commons attribution-sharealike license.
Give it a read and then ask your questions in the chat.
We can research this topic together.
In law, term used in a negotiation
In law, an agreement in principle is a stepping stone to a contract. Such agreements with regard to the principle are usually considered fair and equitable. Even if not all details are known, an agreement in principle may, for example, outline a schedule of royalties.