The phrase "exclusivity requirement" means that something can only be used or accessed by a specific person or group and is not available to others. Full definition
I really wanted to make the ebook available through Kindle Unlimited and the Kindle Owner's Lending Library, but unfortunately Amazon's 90 - day exclusivity requirement for KDP Select is far too strict (that's a topic of another post). (blog.the-ebook-reader.com)
I didn't have a big problem with Amazon's exclusivity requirement in KDP Select when Kindle Unlimited wasn't in the picture for one simple reason: Amazon was paying authors more in royalties for being exclusive to KDP. (hughhowey.com)
Oyster and Scribd have no such exclusivity requirement, but self - published books must be distributed through Smashwords to make it onto Oyster's shelves, whereas authors have the option to go through Smashwords, INscribe Digital, BookBaby, or Draft2Digital to be included in Scribd's library. (janefriedman.com)