The program itself is perfectly legal. It is just a peer to peer file sharing program (p2p).

Once the user downloads the program, it is the users responsibility to know what is legal and not legal to share or download.

Each Nation, Country, State, City, Province, or Village have there own laws that cover what is legal and illegal to share or download.

It is the users who make up the network and not LimeWire.

So my suggestion is to check the Laws in your area to see what is legal and not legal to share or download.

You can also use the forum's search function, upper right between f.a.q. and home to search this topic further, as it has been discussed many times before.