Just to be clear, you may only unzip LFS and unlock it on 2 computers in one location - e.g. you can install it on 2 PCs on your home network. If one of those PCs leaves your house, LFS should be locked.
You MAY NOT share your LFS account with a friend. If you do, you will be in breach of the LFS licence agreement. I'm not flaming, I'm just giving you a heads-up