Why can others not open a PDF after I have digitally signed it.

I have a PDF that I have digitally signed that others users, MACS and WINDOWS can not open after my signature is applied on my computer.  I can still open and view the document with no problem.  I have been able to successfully sign the document on a different machine which was then usable by others.  This problem is new since I upgraded to 10.1.4, or at least now notice it. 

What exactly happens when others try?

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