Whitespace (as in the SNOW technique) is one of the channels Snowdrop uses to conceal its watermark, but not the only one-- for English text, it also introduce

Whitespace (as in the SNOW technique) is one of the channels Snowdrop uses to conceal its watermark, but not the only one-- for English text, it also introduces typos, changes punctuation marks, and replaces some words with synonyms.