Fonts have a feature called ligatures, where you can take two or more letters and turn them into one glyph. You usually use them to improve readability but sinc

Fonts have a feature called ligatures, where you can take two or more letters and turn them into one glyph. You usually use them to improve readability but since there aren't any rules around what the 'combined' glyph looks like, people sometimes do things like change all instances of one word with another. In this case they're blacking out certain words. It's really a job for natural language parsing, but the effort is commendable.