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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <html> <head> <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=us-ascii"> <meta name=Generator content="Microsoft Word 10 (filtered)"> <title>Message</title> <style>  </style> </head> <body lang=EN-US link=blue vlink=purple> <div class=Section1> Rick,   On a fax document, the date/time and ID of the sending machine are part of the transmitted image; added to the image by the sender.   In keeping with current fax, I would think that we still want this information as part of the image. So I guess I think that answer is “no, the information in the dictionary is not quite enough”. If the doc is printed and the soft copy discarded then this information is lost.   The digital signature does validate the data from the originating sender, but what if the receiving user decides to try to re-fax what he just got?  Do we replace the signature and the URI stamp?   Gail        -----Original Message----- From: Rick Seeler [mailto:rseeler@adobe.com] Sent: Monday, February 03, 2003 12:50 PM To: Gail Songer Cc: ifx@pwg.org Subject: RE: IFX> Sender URI Stamp   <div> Gail, </div> <div>   </div> <div> A digital Signature gives you a tamper-proof way to time-stamp a document, but besides that... </div> <div>   </div> <div> What about using the information in the "Document Information Dictionary" (See Table 9.2 in the PDF Reference 1.4)?  This dictionary is already part of the PDF/is spec. and should be all that is needed.  Of course, it's not tamper proof unless the document is also digitally signed. </div> <div>   </div> <div> Is this what you were looking for? </div> <div>   </div> <div> -Rick </div> <div>   </div> <blockquote style='border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in 4.0pt; margin-left:3.75pt;margin-top:5.0pt;margin-right:0in;margin-bottom:5.0pt'> -----Original Message----- From: owner-ifx@pwg.org [mailto:owner-ifx@pwg.org] On Behalf Of Gail Songer Sent: Monday, February 03, 2003 12:11 PM To: ifx@pwg.org Subject: IFX> Sender URI Stamp Hi,   It’s occurred to me that with PDF we have level of portability that we didn’t have before.  However the IFX spec requires that the sender add the URI of the sender:   The Sender MUST place the Sender’s URI, i.e., the value of the “sender-uri” attribute (see section 8.3), along with the date and time, in one of the following places, DEPENDING ON IMPLEMENTATION: 1.    On a cover page automatically generated by the Sender that is sent before the rest of the document. 2.    Merged with the first page of the document. 3.    At the top of every page of the sent Document. The Sender MAY include additional data (Sending User, Receiver identity, etc.).  As for regular FAX, it is RECOMMENDED that this information be represented as bit map data, so that it is more difficult for it to be modified before it gets to the Receiver.     My first thought was to add an optional field to the PDF that indicated where the Stamp was located.  If the doc was resent, then the second sender could replace the Stamp with its own stamp.  But if the doc was digitally signed then either the Signature would be lost or invalidated.   Anything thoughts on how we should handle this?    Gail </blockquote> </div> </body> </html>