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The following archive was created by hippie-mail 7.98617-22 on Fri Aug 21 1998 - 17:16:50 ADT
Michael Graffam (phundie@mhv.net)
Fri, 3 Apr 1998 11:50:08 -0500 (EST)
On Fri, 3 Apr 1998, Marty Levy wrote:
> I want to distribute .pdf files to various people and have them be
> "watermarked" (traceable to the person I sent them to in a non-
> repudiable fashion).
I do not believe this is going to be possible with PDFs. I am not
aware of any watermarking scheme that could stand up to postscript
conversion. There is nothing stopping the person from "printing" the
PDF to a postscript file and distributing that.
It might be best to hide the watermarking in plain sight. Use a different
font for the title in each document.. not exactly the most secure option,
but probably the easiest.
Michael J. Graffam (mgraffam@mhv.net)
http://www.mhv.net/~mgraffam -- Philosophy, Religion, Computers, Crypto, etc
Let you life be a counter-friction to stop the machine.
Henry David Thoreau "Civil Disobedience"
The following archive was created by hippie-mail 7.98617-22 on Fri Aug 21 1998 - 17:16:50 ADT