Final answer:
Licensees must put any promises into writing and have the document signed, ensuring clarity and enforceability of the agreement. The terms must comply with relevant state laws, and they must not improperly restrict use beyond what the license permits.
Step-by-step explanation:
Licensees are generally prohibited from making promises that are not put into writing and signed. This requirement ensures that all parties involved have a clear understanding of the terms and conditions of the agreement. In the context of a license, this could refer specifically to the terms of use or distribution of a product or property. For example, a license may allow the use of intellectual property, but with conditions such as not changing the binding or cover when redistributing a book, as stated in the provided excerpts. It's equally essential that any limitations or disclaimers within a license should comply with state laws and not impose undue restrictions.