Do you know which third-party app was used to add protection to the PDF documents?
Acrobat Reader mobile apps (iOS, Android, and Windows Phone) do not support third-party DRM (Document Rights Management) protected PDF documents.
Example: "protectedpdf" by Vitrium (not Adobe)
As a workaround, please use the desktop version of Acrobat Reader on a Windows or Mac computer to open the protected PDF documents.
Sorry for the inconvenience.
Hi MobileDeveloper CK,
thanks for answer.
I can open both file on PC without any problem using acrobat reader.
Checking on the PC the document properties I found that the protection was generated with Vitrium Systems - protectedpdf
So I guess this is the answer: unsupported third party plug-in...... Is this something you plan to fix or support in the near term ?
I am not able to speculate on any future plans for the Acrobat Reader for iPhone and iPad app. However, Acrobat Reader mobile apps have not supported any third-party DRM technologies (such as "protectedpdf" by Vitrium Systems) in the past several years.
If you'd like, please submit a feature request using the following online form.
Our Product Management team will take your request into consideration for future releases of Acrobat Reader mobile apps.