Decrypt Kno textbooks

I bought some books on Kno textbook store ([url removed, login to view]). When downloaded it is PDF. But i cant open it by normal reader! Sample books can open normally with Adobe reader! They put a DRM on the PDF.

I want to decrypt the book because their reader is too bad! I can not view it in my mobile device. This is only for private use.

Skills: PHP, Software Architecture

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