I have recently written a PDF with LaTeX. That means that you are able to copy and parse the PDF text.
Out of pure interest: How is it possible to convert all pages to images (collected in a big PDF), such that automatical text extraction does not work without some time and expertise?In other words: For a human user, the resulting PDF file should look unchanged and should be able to be printed onto A4 without visible loss, but text extraction (not considereing OCR) should yield not more than a few words.
I know this question, but the result is not one PDF file consisting of multiple images and I fear visible quality loss when doing too many conversion intersteps.
