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Depending on why you want LAN, you may be interested in "Spawn mode" which lets you get all your friends together and play custom games and things. Your friends install the "Starter Edition" as long as one of you owns the game you can all play.

Still requires internet and battle.net accounts.

http://us.battle.net/sc2/en/buy-now/spawning

i want lan so that i can use the product i paid for without having to check in with bliz every time i do it.

Hopefully somebody will create an unauthorized patch that enables LAN play and then Blizzard will have to release an official patch to compete with it.

You could as well ask for dedicated server and mod tools for the call of duty franchise.