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  1. Signature is invalid

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    1 comment  ·  Acrobat for Windows and Mac » Security & Digital signatures  ·  Admin →
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    Michał Jakubowski shared this idea  · 

  2. Digitally Sign option is disabled when document is certified

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    3 comments  ·  Acrobat for Windows and Mac » Security & Digital signatures  ·  Admin →
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    Michał Jakubowski commented  · 

    Then why does the same file, but with additional signature (but made with application provided by qualified signature vendor) is verified in Adobe Acrobat Reader as valid? Acrobat says that all signatures are valid and additionally, "Changes have been made to this document that are permitted by the certifying party"
    Why won't Acrobat allow making such signature?
    To be consistent, shouldn't the verification be invalid according to your interpretation?

    I attach said file.

    Michał Jakubowski shared this idea  ·