Originally Posted by SpiderMatt
Looks like the ASIN is not stored in the ISBN slot of Kindle books. Does anyone know how I might put that info into an ebook?
You can do it in Calibre. The ISBN tag is available for editing, along with Title, Author, etc.
As far as I can see, this works will DRM books as well. But whether the Kindle actually "sees" the edited ISBN, I don't know.