The amount of instruction needed varies among different jobs. My interpretation is that such an action is outside of the data or software itself, thus not a right granted, but recognize that others may have differing opinions. The government gets certain rights to use, duplicate, etc.
Rather than the abstract, let’s speak of specific rights. Not all agreements are necessarily contractual, as the parties generally must be deemed to have an intention to be legally bound. Less common are unilateral contracts in which one party makes a promise, but the other side does not promise anything. In certain circumstances, an implied contract may be created.
Although an invitation to treat cannot be accepted, it should not be ignored, for it may nevertheless affect the offer. Moreover, legally, there is a series of variations between the rights of a full-time or part-time employee and that of an independent worker. When you are self employed you are the one responsible for taking care of the bookkeeping, taxes and all the record keeping