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I received pdf file with protection
Protection is made with use sertificate (.pfx)
Sertificate was successfully installed on my Android.
But Adobe Reader give me warnings "Error. Document is contained function, which not supported on this version"
How I can open it?
It very important for me.
You need the desktop version of the Adobe Acrobat Reader DC in order to open this PDF.
As you have mentioned above, the PDF is secured with the certificate.
It seems that the PDF file is Reader specific version and it is not compatible with the mobile application.
Try once to open the PDF on your desktop application and let us know if you still experience the issue.
Let us know how it goes.