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Honestly, its presence at several reputable online bookstores is probably the best assurance you can get.
There's no way I know of to check if an author had signed away rights to a publisher, etc. But if the book appears at Amazon, Kobo, etc., it will be seen by many people, at least some of whom are bound to mention it to the author. And reputable vendors, like Amazon, etc., respond to "take down" notices.
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