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Topic: beg help: document expiration date (Via Email)
Conf: (P-PDF) Beginners, Msg: 91863
From: iaw4
Date: 7/11/2003 06:59 AM


Apologies, but I have been trying to find an answer to this for a long
time, and am stuck.

I want to prevent easy use of .pdf documents after 1 year. I basically
want to inform users that they should download a newer version.

My first choice would have been to do this inside the .pdf code itself,
something like (the pseudo code)
if (currentdate()>2004-12-31) then stop-pdf-interpreter;
or just print "please download later version" then output a page, and
then stop interpreter. unfortunately, I believe that postscript has no
current date function, so this is impossible. I would love to be wrong,
of course.

My second choice is to use javascript. Bad news: I know neither ps,
nor pdf, nor javascript (except basic language ideas). I want something
that does the following:
if (currentdate()>2004-12-01) then
put up alert box that says "please download later version" every
time a page is progressed to or opened.
if possible, scramble or eliminate contents of the pages
themselves, and/or close the pdf interpreter.
I would be highly appreciative of any help, if possible cc'ed to
ivo.welch@yale.edu .

sincerely, /ivo welch




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