I thought of an evil hack w/ web fonts the other day. Seems it'd be fairly simple to use randomly re-sorted fonts (where characters are mapped to improper code points) as a kind of one-time-pad to jam HTML scrapers or surveillance of the line. The user's browser would get the appropriate font and be able to read the text; anyone reading the raw HTML would get gibberish, forcing anyone trying to extract the data to use OCR. Obviously this would kill your site for search engines, screen readers, etc., so the only use would be if you're seriously paranoid about your data getting scraped, and only then if the scraper had limited resources (the NSA, etc. can probably spare a few cycles for OCR).