You can put a message on remote ssh login for user or it will just act as a warning for a defaulters.
Steps:
1. Open a file using : emacs /etc/motd and write a messge you want
e.g.
********************************************************************
* *
* This system is for the use of authorized users only. Usage of *
* this system may be monitored and recorded by system personnel. *
* *
* Anyone using this system expressly consents to such monitoring *
* and is advised that if such monitoring reveals possible *
* evidence of criminal activity, system personnel may provide the *
* evidence from such monitoring to law enforcement officials. *
* *
********************************************************************
==========================================================
Unauthorized access to this machine is prohibited
Press
2. Save the file and exist.
3. Restart the ssh service using. #service sshd restart