Oh boy.....
DISCLAIMER: Habilis is not a Lawyer of any form and shape. Therefore, this may not be taken as a legal advice under any circumstances. Be sure to check with your local regulations and copyright law. Habilis is just a school kid.
You, as the server administrator, host Ragnarok Server Emulator.
Which is the open source software developed by a group of enthusiast and released free of charge.
Thus, you as the server administrator
may not under any circumstances be held responsible for pirated/counterfeit (Client) software
* players and other 3d party use to connect to your server.
*So long it is not you who distribute the Client software.
(A simple link to a filestock hosting the client, as long as the client is not hosted on your server)
Therefore if you receive any Emails from the lawsuits,
feel free to send them the most distinct expression of
on your and your server's crew behalf!
Hopefully, this closes the question of legality...