IPad Acrobat DC DRM eBook University Unable to Unlock Protected PDF: other reader works

This post was updated on May 2:Added DRM software name and new attempt to open store the ebook in acrobat cloud and open from there.
Repeatable Yes I have tried on multiple eBooks
DRM software: protectedpdf from Vitrium
Acrobat DC Reader (same behavior on the old Acrobat reader for iPAD)
iPAD2
iOS 8.3
I was hopeful this new version of PDF reader would allow me to open eBooks from my university. No such luck. It's not the university PDF because PDFReaderPro across iOS types opens the Vitrium powerpdf protected ebook's just fine.
Behavior: Unable to enter in user name and password. Fields are viewable, but I'm unable to enter data in either field.
...So I send it (image below ) to PDFReader Pro and the document opens after I type in my university username and password.
Adobe. Why can a 3rd party open a DRM PDF file, but not Adobe?
PS, works fine on the Desktop using Acrobat readers. It is Not the file.

Hi,
Currently, Adobe Reader for iOS disallows any changes (e.g. adding annotations, filling out text fields) to protected or encrypted PDF documents.
It is one of the known limitations in Adobe Reader mobile products (for iOS, Android, and Windows Phone).
You can use the Feature Request form. The Product Management team will take your request into consideration for a future release of Adobe Reader for iOS.
Sorry for the inconvenience.

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