We are trying to convert a signed PDF to PDF/A-1 or PDF/A-3b. When viewing the converted PDF in Adobe reader, the blue bar shows the signature is not valid.
I have googled a lot about whether we can convert a signed PDF and the answer varies.
Could you help to explain that is the converted file valid? How about the digital signatures? Sometimes we also get error thrown with PDF/A-1 but not PDF/A-3B.