Downloading pdf on iPad mini, opening in Adobe reader, won't open, saying this is not a valid pdf document

Hi
I am trying to open a pdf document which is a course qualification handbook.
I have been able to open other pdf documents in the adobe reader app, any suggestions how I can open the above document.
I am using an IPad mini.
Thankyou

Is the course qualification handbook "protected" in any way?  For example, to limit the access to the content, a protected PDF document may prompt you to enter user name and password or use some proprietary technology to obscure the content.
Adobe Reader mobile products (Adobe Reader for iOS, Android, Windows Phone) do not support eBooks, protected PDFs, etc.
Would you try opening the course qualification handbook in the desktop version of Adobe Reader on your Windows or Mac computer and see what happens?

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