The lyric site Genius was certain that Google was republishing their lyrics without permission, so they devised a clever steganographic method to catch Google stealing. By using a combination of straight and curly apostrophes, Genius secretly embedded the phrase “Red Handed” in certain song lyrics:
To no surprise, Genius then saw the hidden message in Google lyrics, thus confirming their suspicion. Ironically, Google used a similar stenographic method to catch Bing stealing search results by purposefully creating nonsense search terms which later surfaced in Bing’s results.
Source: Google stealing Genius Lyrics & Bing stealing Google search results