prevent OCR

Hello, I want to generate some document to put on the net, but I want
to prevent OCR.
I was thinking of typing the text in a graphics editor and saving it
as GIF format, but how could I modify the final image so it makes OCR
impossible (or at least hard).
Not that I am against OCR, it is very useful, but it is to protect
some important document I want to make available to some people.
It's ok if it is difficult to convert to text, but I don't want to
send some plain text that anybody could cut/paste anywhere.
Thanks a lot!
Bob