Forum


    Reply
    Replies: 1   Views: 1338
    Certificate for signing a pdf file
    Topic closed:
    Please note this is an old forum thread. Information in this post may be out-to-date and/or erroneous.
    Every phpdocx version includes new features and improvements. Previously unsupported features may have been added to newer releases, or past issues may have been corrected.
    We encourage you to download the current phpdocx version and check the Documentation available.

    Posted by admin  · 16-10-2020 - 15:48

    Hello,

    Adobe, and other programs, displays the validity of the certification is uknown message when the certificate/CA is not trusted by Adobe, so you need to accept (trust) it or use a certificate accepted in Adobe as trusted.

    We recommend you to check if AATL is updated in your Adobe PDF reader (https://support.globalsign.com/aatl-document/how-manually-update-adobe-approved-trust-list-aatl-adobe-acrobat-reader) and the certificate/CA you are using is trusted by Adobe. 

    On https://stackoverflow.com/questions/13979845/signed-pdf-showing-message-the-validity-of-the-document-is-unknown-itext you can read more information when Adobe displays that message.

    Regards.