Watermarking (was Re: Content Provider Problem?)
Jim Davis (davis@DRI.cornell.edu)
Mon, 19 Sep 1994 13:47:10 -0400
People at Bell Labs have published on techniques for making
small alterations to PostScript files such that each version
of the resulting document is unique but still readable.
These were, I think, but only recently mentioned on this
very list, unless my memory misleads me:
ftp://ftp.research.att.com/dist/brassil/infocom94.ps and /docmark2.ps