RS - Password security : Runescape News

We would like to remind everyone to NEVER enter their password into the RuneScape chat. Not for ANY reason! In an attempt to better protect our players' passwords, we've updated the game to prevent you from saying any sentence which contain your exact password. This is only a basic check, however, and it's still extremely unsafe to type your password into the chat, so please DON'T try it out to see! That would be foolish and extremely dangerous.
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http://news.runescape.com/newsitem.ws?id=777