Eli develops and patents the technology behind the VuYu, which allows its users to stream high-definition video from online video services directly to a television set. Eli assigns the rights to Bright Lights, Inc. In exchange, Bright Lights agrees to make and market the device, and assigns a right to receive a percentage of the gross sales revenue to Eli.

Can these rights be assigned? Yes. As a general rule, all rights can be assigned, except in special circumstances. If a ______________ expressly prohibits the assignment of a certain right, the right cannot be assigned. When a contract is ______________ in nature, the rights in the contract cannot be assigned. A right cannot be assigned if its assignment will significantly ______________ the risks to or the duties of the obligor. If a ______________ provides that certain rights cannot be assigned, then they cannot be assigned. The rights in this contract do not fall into any of these categories.