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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"> <TITLE>Message</TITLE> <META content="MSHTML 6.00.2800.1126" name=GENERATOR> <STYLE>  </STYLE> </HEAD> <BODY lang=EN-US vLink=purple link=blue> <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 dir=ltr style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #0000ff 2px solid; MARGIN-RIGHT: 0px"> <DIV></DIV> <DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left>-----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 </DIV> <DIV class=Section1> 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</DIV></BLOCKQUOTE></BODY></HTML>