Why the digital sign done with Adobe Reader is considered not valid or non present if I verify the signed pdf with another software for the digital signature?

[francescac93756866]

I'm trying to do a digital signature with adobe reader (pades signature, extension .pdf). When I verify my signed document with Adobe, re opening it, everything is ok, it tells me "valid digitale signature". But when I verify the document with another software for the digital signature (for example: aruba sign, Dike) it tells me that the signature IS NOT VALID, or NOT PRESENT. Which is the problem of the adobe signature?

[Tariq Dar]

Hi francescac93756866,

You may visit this help page Validating digital signatures, Adobe Acrobat and let us know if this helps.

-Tariq Dar.