All letters may be encoded as special symbols "inside" HTML. For example "a" may look like "& #97;" (without space after &) within HTML code, string "hello!" - "& #104;& #101;llo!" - but browsers render both "standard" and "encoded" variants of letters as visually identical symbols. It's not some sort of evil hack: common use for this method is to print special symbols (like ä) using standard qwerty keyboard. However search engines see "hello!" and "& #104;& #101;llo!" as different strings. This is an opportunity to make texts unique while keeping them perfectly readable - by replacing few symbols to their "hexadecimal" counterparts.
To use this facility put your article into text field to the left, push "make unique" button, then copy-paste resulting text from right text field into your blog or site in "source code" mode (in visual mode all special codes will be replaced with letters - do not use it). Check if your site/blog can handle these codes without rewriting them into normal letters - see source codes of pages with saved texts.
This facility randomly replace one of every 50 letters in text: in such manner your article will have most of words un-touched thus search engines will recognize them. HTML code inside tags will remain untouched (but tags with errors - like space after < - < a> - will be rewritten).
NOTE: your site may lose special symbols after re-saving uniquefied articles (symbols - like "& #97;" - will be transformed into standard letters). Be careful.
