What you are looking for goes by the moniker "digital rights
management" or DRM for short. This is Microsoft's "next big thing" and
is being slowly worked into a number of places. For what you are
looking for, I think that there is an eBook format that might do the
trick, but I also think it is Windows only. Right now I don't know of a
robust cross-platform method of doing this for any type of media,
especially not for something like a PDF. The best I can thnk of is a
password protected PDF.
Karl Kuehn
email@hidden
On Oct 13, 2003, at 12:31 PM, John Crockford wrote:
I have a client who has asked me to research a way to limit the number
of copies (or prevent additional copies being made) of a short book on
film-making that he wishes to market over the internet. He currently
has the book in pdf format. Googling for "file copy limit" has turned
up only sources related to file size limitations during
transfers/uploads/etc. Can any one get me pointed in the right
direction?
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