pdf signature requires validation vs signature has problems -

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anybody, please explain what's difference between signatures. when open 1 pdf document - adobe acrobat 9 shows message "at least 1 signature has problems" if open other pdf message "at least 1 signature requires validating". seems both pdfs signed self-signed certificates, messages not same. difference extremely significant our business. please help.

making comment actual answer

at least 1 signature has problems implies adobe acrobat has tried verify signature failed doing so.

at least 1 signature requires validating implies adobe acrobat has not tried verify signature and, therefore, has not yet decided whether fail or not.

whether or not adobe reader / acrobat tries verify signature depends on filter , subfilter entries of signature dictionary:

  • if reader / acrobat knows them, automatically tries verify signature (unless configuration settings changed).

  • if knows subfilter not filter, not try verify automatically @ least offers verify

  • if not know subfilter, not try verify.

the op verify this:

i've changed subfilter cms cades , message changed "at least 1 signature has problems" "at least 1 signature requires validating".

on acrobat xi, though, message presumably become "at least 1 signature has problems" again because adobe meanwhile has started supporting pades subfilters.


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