Answer: C, D, E
During the validity period of the patent, the patentee can flexibly authorize different objects to implement its patented technology in different scopes, bringing benefits to the patentee. Get considerable profits. According to this scope, patent licensing methods can be divided into five categories: exclusive license, exclusive license, general license, sub-license, and cross-license. The order of effectiveness is: exclusive license > exclusive license > general license = sub-license, cross-license The legal effect depends on whether the license agreement is exclusive or not. If it is exclusive, the effect is equivalent to an exclusive license; otherwise, it is equivalent to a general license.