The phrase "hadst rights" is an archaic way of saying "you had the right to." In modern English, there are several synonyms that could be used: "you were entitled to", "you possessed the privilege of," "you had the authority to," "you had the permission to," or simply, "you had the right to." All of these phrases express the same idea that someone had a legitimate claim to something or the ability to do something. It is important to recognize that language evolves over time, and what may have been commonly used in the past may not be as relevant or widely understood today.