good library for pdf

Enrique Palomo Jiménez enrique.palomo at
Thu Jan 26 04:08:13 EST 2006

Hi all,

I want to take an existing pdf and add it a non-opaque watermark.
I have tried it in postscript but postscript hava an opaque imaging model.
Pdf allows it. I can do it with acrobat 6.0, but i need to add the watermark in batch mode or inside an application.

I've found lowagie library for java.

Anyone knows if there is something similar for python??

must i begin to learn java?? 


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