Adding content after signature invalids signature (only in adobe)

[Bernd26717992y3mp]

I have an pdf. I signed it, then I add another signature. The first become invalid because of changed pdf. This also happens, when I add the dss-information after the signature.

The problem is only visible in adobe.

All other pdf-verifing software say "okay". The pdf is okay, because nothing is changed in the byterange of the signatur.

What can I do make adobe verify it okay?

I added examples:

The eep_GdPicture.pdf ist the unsigned original pdf.

eep_GdPicture_signed.pdf has two invalid signatures (says only adobe)

Bernd

[Abambo]

When a signed document is modified after signing, the signatures become invalid. That's expected behaviour. Whatever other software you use, it's not working correctly.

[Bernd26717992y3mp]

But it´s an incremental update ... nothing is changed in the byterange of the sig ?!

[Abambo]

If you change a document after signing, you changed the document and signatures need to get invalidated as the document is not anymore as signed.

[Bernd26717992y3mp]

No, the signed content of the document isn´t changed (the sig has a tag ByteRange [ ]) this has no changes ...

[Shurmano]

As you say if it was applied on an incremental update,  it may work. Maybe is a problem with gdpicture sdk, producer of that document?