Some pdf files cannot be read by eReaders other than Acrobat

I have several books in pdf format.  All, including the attached, read perfectly in Acrobat and all, except the attached, read perfectly in various eReaders.  The attached file, however, cannot be read by any reader other than Acrobat and cannot be imported into Calibre and converted to any other format.
What is unique about this file?
I can not find any way to attach the file.  Please post instructions.
Using Windows 8, Adobe Reader X 10.1.8,

You cannot attach PDF files to the forum, only images (e.g. screen shots) and not at all in an email reply.
To share a PDF put it on acrobat.com, your own web site, or a file sharing site, and reply with the URL.
What does Adobe Reader X say for Document Security (under File > Properties)? The SECURITY METHOD is the key information. You are quite correct that some PDF files use security methods which lock them to Acrobat.

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