Invalid Digital Signature in Adobe Rader 9.0

Hi there,
Need help regarding Digital Signature on PDF doc.
I have a pdf file with 2 different digital signature.
If i'll try to open pdf file in Adobe reader 8 both signs are showing as valid signature with green mark.
but if i'll open pdf in Adobe reader 9 first sign is showing as invalid signature with red cross.
Can you someone pls help and let know the resolution for this error.
Would appreciate ASAP help.
Thank you.
Cheers,
JR

Steve,
Thanks for reply.
I am talking about same file but with 2 different signatures.
(on different location of the page, one is on left side of page and another on right side of the page)
If you can share you email so i can send you the file or let know , how i can attach the .pdf here. (i can attach picture file, html file, video etc. but can't attach .pdf)
Cheers,
JR

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