If I recall you can use a Map Legend to protect yourself, but I cannot recall the case. Some person made a legend to safe guard his password. He was force to ha

If I recall you can use a Map Legend to protect yourself, but I cannot recall the case. Some person made a legend to safe guard his password. He was force to hand over his legend but did not have to tell (FBI/CIA) how to decipher it. Anyone know what I'm talking about. Sorry if this is off subject, just thought it might be interesting to look up.