Hi all.

After a couple of days triyng about, and read many posts, I'm unable to 
add a watermark to a existing signed PDF without broken it. In Adobe 
reader the signature appears broken, with error "byte range is invalid".

I know that this can be posible, because I have done it manually though 
Adobe Acrobat Profesional. (Document->Watermark->Add). I have open 
"pdf_signed.pdf" file, and add a watermark to every page of it, saving 
the result file to ""pdf_signed_and_watermarked.pdf".

I have compared both two files, pdf_signed.pdf and Acrobat resultant 
"pdf_signed_and_watermarked.pdf", and the latest is identical byte to 
byte to the original one, but with a added content. As if  the added 
content act as a "revision" or "upgrade" of the original document.

My question: How can I make this with iText ?? If iText can't: There are 
another library that  I can use?

thanks



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