EXCLUSIVE LICENSE– When granted, an exclusive license limits not only the client in their use of the licensed image(s), but also the photographer in their ability to license the work to multiple users. It’s also important to note that exclusive licenses can be very broad or very specific. The license might grant the licensee exclusive rights to use a photo singly, or in any combination of a specified media, industry, territory, language, time period, product, and/or any other specific right negotiated between the licensor and licensee. 我一般都签non exclusive的