For one of my paychecks I tutor college students via e-mail. As you can
imagine, most students are perfectly happy to copy an example I send them
and turn it in as their own work.

Up until today I thought sending examples in PDF format (created with
openoffice) would prevent the copy & paste problem. However, the Adobe free
PDF reader allows you to select and copy as if you were using a plain text
file (I didn't know that before today). I don't care if they retype my
example (at least I know they've read it), it's the copy & paste I'm trying
to prevent.

I can create a password protected PDF with PDFCreator (Win32 only). What I
want is a free linux solution.

I'm looking into "pdftk" but I'd like to know if any of you know of other
options.

Thanks,
Bart

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