The Traffic Light Protocol (TLP) is a well-known set of classifications for sensitive information.
The TLP classification is regularly used by the CSIRT community and other organizations around the world.
I was looking for a way to indicate the TLP classification during physical meetings.
So, I created a small A4 landscape set of posters for each TLP classification to display on the door where the meeting is taking place.
The documents are released under CC0 1.0 DEED.
You can copy, modify, distribute and perform the work, even for commercial purposes, all without asking permission.