Possible Duplicate:
PDF with un-copyable text
What is the most effective ways to protect text in a PDF from being copied with Ctrl+C?
I know about standard PDF copy protection, and also know that it can be removed relatively easily. [BTW: Can this copy protection be added to a PDF directly from Latex?]
Inspired by "Is it possible to provide alternative text to use when copying text from the PDF?", I tried:
\documentclass{article}
\usepackage{blindtext}\usepackage{accsupp}
\begin{document}
\BeginAccSupp{method=escape,ActualText=}
\Blindtext[3][2]
\EndAccSupp{}
\end{document}
This appears to protect the first page in Adobe Reader 9 against simple copying. The second page is not protected anymore. Is it possible to extend the protection to the entire document? It also appears that all text remains accessible in Foxit Reader 4.3.
I imagine a very effective approach would be to add invisible garbage text after each few letters. This would increase the size of the PDF a bit but this would not be a problem.
Any ideas are much appreciated.
A powerful approach is redefining the Cmaps of the fonts, suggested in an answer to "PDF with un-copyable text". How can this approach be used together with non-standard fonts? E.g. such as Times loaded through package \usepackage{times}
or \usepackage{mathptmx}
?