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I read the whole article and didn't find any explanation what "KU" was. Now I find here that it means "Kindle Unlimited" but I still have no idea what it is. Some kind of subscription service?

I buy a lot of Kindle books but never seen any "Unlimited" offer, perhaps something that is US only?

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Kindle Unlimited is Amazon's "Spotify/Netflix for Books" product. $10/month to read any book enrolled in the Kindle Unlimited program.

Thank you. I just tried to read more about it but all I got from amazon.com was "We're sorry. Kindle Unlimited is not available in your country. Please stay tuned.".

Not sure what you mean. It's not in my country either, but I can easily access a page like:

http://www.amazon.com/gp/feature.html?docId=1002872331

Besides, there's always:

https://en.wikipedia.org/wiki/Kindle_Store#Kindle_Unlimited

http://ebookfriendly.com/kindle-unlimited-ebook-subscription...

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