I have adobe acrobat reader 9.0. I want to combine multipe pdf files including a pdf file that contains a digital signature. Is there anyway to combine all the pdf files including the one with the digial signature. Everytime I combine the signture pdf file the digital signature gets stripped.

Hi rrpalomo and welcome.

Since many pdf files are copyrighted materials, they are protected to avoid others from stealing the material, plagiarizing, or using it without permission of the author. So I suspect you are running into copy protection and suggest you contact Adobe tech support.