Digital Signature with PDF problem

I followed the steps in Administrator's Guide for Oracle Business Intelligence Publisher to assign PDF files with Digital Signature ,,
however when i schedule a new job it succeeds but i don't get my digital signature ,, but i get an empty square with nothing written in it.
however, when i tried to sign my PDF directly form Adobe and it worked ok ,, so there is no problem with my PSK file,,
i have uploaded an output sample (you can notice the square, where the DS should be, in the top-center area)
the sample output
http://www.mediafire.com/?68kt60sxx3i3aie
i hope there is a solution to this problem ,,
Regards
Alaa

Gerorge, thank you so much. I have since upgreaded to Pro and am now trying to figure out how to use the digital signatures correctly. I have sent out a test form and had a coworker complete, sign and send back but when I open up the form it says I have a signature error. and then i get this pop up when I click on the signature
What am I doing wrong? I work in HR and need these to be valid signatures. Thank you so much in advance!!!

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http://iasdocs.us.oracle.com/iasdl/bi_ee/doc/bi.1013/e12187/T421739T481159.htm#5013638 (refer section 'Adding or Designating a Field for Digital Signature'
http://iasdocs.us.oracle.com/iasdl/bi_ee/doc/bi.1013/e12188/T421739T475591.htm#5013688
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Link:[http://www.sdn.sap.com/irj/scn/index?rid=/library/uuid/e0fbaa71-cd8d-2910-5982-e30626035400]
Link:[http://help.sap.com/saphelp_nw70/helpdata/en/18/ecb69017ad4765855425b97f666470/content.htm]
Link:[http://www.sapfans.com/forums/viewtopic.php?f=13&t=346498]
Link:[http://www.saptechies.com/digital-signature-for-form-16/]
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