Technology Transfer - License Agreement

You are a partner in a law firm and you have asked a new associate to draft a license agreement for a U.S. client, which is licensing its technology to a licensee in Belgium. The new associate tells you she has never drafted a license agreement before, and she has some questions. First, she says she knows the granting clause and the grant-back clause in the agreement are very important, but she does not know why. Second, she asks what she should know about drafting a clause dealing with Royalties. Please tell her what she needs to know to be able to draft these clauses in the agreement.