I guess this would be your starting point:
Ideally you take a picture of an emergency evacuation plan, use a scanner app to remove the distortion, and then put it as background in JOSM to trace the layout
Don't copy from maps you don't have permission to use.
https://wiki.openstreetmap.org/wiki/Copyright#Proprietary_data
I don’t think they are copyrighted? They are made according to ISO23601
@Zwiebel @openstreetmap
I would expect ISO to be among the last organisations in the world to suggest that copyright should be waived for something or that there should be an open license.
Of course I'm not going to check in this instance because as a typical ISO standard it is obscenely expensive.