[EDIT: I assume the main point was to make documents readable, but hard to copy. My comment is about breaking this trivial copy protection scheme. I see that other comments read the purpose of the font differently.]
Given a long document, one could easily crack this Caesar substitution cipher. Of course one could also do OCR on the characters to learn the mapping.
Tangentially, these thoughts remind me of a cool Master's thesis [1] where they did basic OCR, by clustering blobs of ink and solving the Caesar substitution cipher, rather than trying to recognize the shapes of the letters! That approach can be used to adapt a real OCR system to the current document.
Comments
[EDIT: I assume the main point was to make documents readable, but hard to copy. My comment is about breaking this trivial copy protection scheme. I see that other comments read the purpose of the font differently.]
Given a long document, one could easily crack this Caesar substitution cipher. Of course one could also do OCR on the characters to learn the mapping.
Tangentially, these thoughts remind me of a cool Master's thesis [1] where they did basic OCR, by clustering blobs of ink and solving the Caesar substitution cipher, rather than trying to recognize the shapes of the letters! That approach can be used to adapt a real OCR system to the current document.
[1] http://www.cs.toronto.edu/~scottl/research/msc_thesis.pdf