如果你指的是jk罗琳的授权 那估计一般人拿不到 或者费用非常惊人。。。

Warner Bros. Consumer Products, Inc. operates as a licensing and retail merchandising organization. It licenses the rights to names, likenesses, and logos for all intellectual properties in Warner Bros. Entertainment’s film and television library. The company was founded in 1984 and is based in Burbank, California. Warner Bros. Consumer Products, Inc. operates as a subsidiary of Warner Bros. Entertainment Inc.
简单用中文解释一下，就是这家公司Warner Bros. Consumer Products, Inc. 管华纳旗下所有知识产权的商业授权。
据说这个license很昂贵而且对合作商家要求很高。如果楼主确实想要合法经营可以联系4001 West Olive Avenue
Burbank, CA 91505
United States
消息来源Bloomsberg. Company Overview of Warner Bros. Consumer Products, Inc.