Hi,
 what I usually do, if the purpose is to only send a message to the user, is
having an unfixed semi transparent annotation in the MapCanvas.

I also configured a default project on startup having such an annotation,
that is always displayed on screen, including when users do screenshots:

** Project description:
    author:
    context of use and constraints:
***

We could imagine to use OWS project properties to store such informations..
By now, the annotation is enough for me. 
Cheers








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