PDF Security: A Question

I am searching for a 3rd party company that provides pdf password protection -
pdf encryption. I am aware: nothing is hacker-proof. I just want a deterrent. I
don't want a high end DRM company. I'm hoping to find a 3rd part product that
fulfills the following criteria. Anyone have any suggestions? Thank you in
advance.

A. GENERAL IDEA: password protection that ties pdf file to the individual
computer and prevents them from illegal sharing. (I don't care if they modify or
print)

B. User inputs password only once (unlike Adobe's), the first time he opens pdf
file.

C. User cannot duplicate file and place on another computer and/or place on a CD
or other removable medium (and still have it function).

D. Work across PC and MAC platforms

E. Different password generated for each document

I am looking for the same kind of solution, making sure that it gets VERY
tedious to copy those e-books of mine, unless going through the payment
process.

I think of a different approach, though - which I think would be simpler.

The objective (as well as your objective, from what I understand) would be
accomplished if the file could copy ONLY ONCE. That would enable a paying
customer to download the file from the server to his/her own machine - and then
it would just never move from there... As you say, personal printing is OK. But
transferring over a network or to a CD or to some other removable drive is
certainly NOT OK.

It would be preferable to only enable that first and only download with a
password, which can be sent automatically when the payment process is completed.
This would make it technically possible, I think, to enable multiple downloads
of the file on the server, but once opened with a password, all copying it
locked.

Any comments on this? Or alternatives that will accomplish the objective of
making distribution very tedious, if not impossible?

Sincerely,

A PDF file is a file. Anyone can copy any file, any time, e-mail it,
put it on a disk or an iPod, without limits. They can do this whether
or not Adobe Reader is installed on a computer, just by dragging and
dropping the files or whatever.

So, I can see that you might see this as a simpler way of protecting
files, but in fact it's just impossible.  What IS technically possible
is solutions which tie a PDF file to a particular machine or user, so
that the copy is useless to anyone else - which is back to DRM.

PDF security, such as it is, is based on DRM solutions, which by their
very nature tend to be a bit high end. For example, they tend to need
a server 24/7 on the internet to keep track of who is allowed what. 

Nolos_Retep's proposal is technically possible but would require a DRM
plug-in to be written for Reader. This makes it much more expensive
than most commercial solutions, the DRM plug-in license costing tens
of thousands of dollars. It would also need custom server software.
However, it has some similarities to products from FileOpen, so take a
look at them.

Passwords tend to be forgotten easily and are a support nightmare and if
licensing control is not used then there is nothing to stop users sharing them.

This 3rd party company software provides pdf password protection - pdf
encryption etc it might help. Visit <http://www.pdflocker.com/>

____________________________
Sincerely, Shair