An assignment sale in copyright occurs when the original buyer of a pre-construction property sells their contract to a new buyer before the property is completed. In such cases, the "assignment sold" refers to the successful transfer of this contract to the new buyer. The original purchaser, known as the assignor, typically profits from the property's appreciated value. The assignee (new buyer) then assumes the rights and obligations of the original agreement with the developer. Assignment sales are common in hot real estate markets where pre-construction units have increased in value before completion.