If there any old Rsc players out there longing to play again and whipe some asses. I just wanna tell you about this awesome server! You can register and download at -snip- ! Happy gaming!

This is against the Jagex ToS, therefore, it will be closed, and the link -snipped-.
Jagex has the rights to everything involved with Runescape.
If the private server is not through Jagex and has items similar or exactly like Runescape items they are up to copyright infringement and can be sued and/or put into jail.
If you don't own these servers and you play on it, you will be okay and wont be in trouble.