Hidden in “plain text” when rendered using their special font. The special font slightly changes the shape of each letter to encode additional information. Title is pretty clickbait. If you copy the “plain text” to ASCII or use a regular font this won’t work.
It works with common font families, such as Times Roman, Helvetica, and Calibri, and is compatible with most word processing programs, including Word and FrameMaker
textmark.io is doing something along these lines but in a different way. It’s a very cool space to be in esp with advancements in machine learning. Disclaimer I am the founder.
This could be a useful variation on a trick for tracking
leakage of documents: distribute N paper "copies" of a
document to a pool of suspected leakers, each "copy" with tracking data embedded, and when leaks occur, match the
tracking data to the leaker. Old way: use apparent
typos to track, this way: use font variations, next way:
use variations in kerning between words.
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[ 0.21 ms ] story [ 28.3 ms ] threadhttp://web.mit.edu/keithw/tlex/lsteg.pdf