Many public certificates, like the time stamp signature form UPF or other AOC issued certificates, have a public key encryption, and Adobe Acrobat cannot recognise them with the default settings. ![]() If Adobe Acrobat says that at least one signature have problems or signature validity is UNKNOWN, it is possible the program is not able to check its authenticity. ![]() Clicking on them you can see further details of the used certificates. Once you open the document, you can access to the Signature Board from a pop-up bar (normally blue) in the top or from the ink pen icon in the side menu and a new board will be displayed with the information of all signatures applied at that document. To validate an electronic signature with Adobe Acrobat you need to download the document in your drive and open it with this program (do not visualize the PDF within your internet browser). It is recommended to have the last updated version. Adobe Acrobat Reader DC is the most used program to read PDF documents globally.
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