I bought The Stand back in July, and it's still in my purchases list on the MYK page, so I'm pretty sure it wasn't a pirated version. It's just a fairly generic cover, which quite a few ebooks I bought last summer had, but it does say Doubleday and has a full copyright page (at the end, a stylistic decision I heartily approve). The copyright page is quite long and includes the permissions for all the song excerpts used in the book. If this is a pirated version, it's one with unusual attention to detail
The book is no longer on Amazon, but I would guess it was for some other reason. When the pirated HP books showed up, the people who bought those got refunds and they were pulled from the list of purchased items. The Stand is still available for me to download on the MYK page.