How to disable Ctrl-F on PDFs

For those of us who create .PDFs that students will use during open-book tests, it would be helpful if we could disable the Ctrl-F function.
I know that if I save the .PDF as a jpeg or something similar, Ctrl-F becomes disabled, but for various reasons that's not a route I'd like to take.
According to a Google search today, there have been a bunch of educators / training managers trying to disable Ctrl-F.
thank you
curt

There is no sure proof way to eliminate searching for information on a regular pdf file by embedding something into the pdf using standard Acrobat technology---which is why you have put in a feature request. Most approaches that don't rasterize a pdf will not work. The student could use a different pdf-reader or disable javascript, if you are trying to limit searching functionality.
There might be a way using an Adobe Livecycle product, you could check the LiveCycle forums, but if that would work we are talking about an very expensive product that requires the use of a server.

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