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I did some tests. First, I added the ASIN of a book sold in the Chinese kindle store to a self-made book, generated a KFX format file with jhowell's plug-in, and imported it into kindle. No matter whether it is connected to the Internet or not, the book does not display the TTS icon. . Then, I purchased the book corresponding to the ASIN on the Amazon website (I chose to let Amazon send the book to the app to avoid destroying the files in the kindle), then I just need to connect to the Internet and reopen the book, then the TTS icon will be displayed, close it Internet connection, functions are still available. Finally, I deleted the purchase record of the book from the web page, and sure enough, the TTS icon was also deleted shortly after connecting to the Internet.
Apparently kindle determines whether to enable this feature for books by downloading and storing some data from the server.
If anyone is interested, they can do the same test. They just need to register an account on z.cn, and search “知乎周刊” to find books with zero price. To buy these books, you don’t need to add a bank card or payment account.
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