There are definitely steganographic measures in place. Reality Winner is currently imprisoned because The Intercept didn't properly remove yellow tracking dots

There are definitely steganographic measures in place. Reality Winner is currently imprisoned because The Intercept didn't properly remove yellow tracking dots from a printed memo she leaked to them. Printed documents are easily tracked this way, and I suspect minor variations and invisible unicode, etc. is used for more widely desseminated digital material. There is almost definitely 10 more martins out there... exfiltration is so diverse of a problem that any system with strict auditing and controls will still have side-channel attacks. >I guess there's always the "you can't stop someone from taking a photo of your computer monitor" problem (forgetting the name rn), but even then you can use little things like spacing words slightly differently per presentation of the file, etc. See https://en.wikipedia.org/wiki/Analog_hole https://en.wikipedia.org/wiki/Analog_hole