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How to secure your phone before attending a protest
(www.theverge.com)
This is a most excellent place for technology news and articles.
I heard prints are unique and have a hidden pattern which can be mapped to a single printer. Not sure if this is true.
It is.
https://en.wikipedia.org/wiki/Printer_tracking_dots
if the government is using printer tracking dots or your phone to track you down for participating in a legal, democratic protest, then the time for protest is long over.
Print at a public library?