I have been playing on this shard for a week. Although I understand the reasons behind rule #1, it's good to make things clear to avoid future problems. Here are some examples:
Scenario 1: I have my own account, which I created on my computer at home. A friend has his own account, which he created on his own computer at his home. Can we both get together to play on the same place?
Scenario 2: A friend of mine is coming to my house with his laptop. I'll show him the game on my computer, and he creates an account at my house. We play a little and then he goes home with everything set up. He'll then play from there.
Scenario 3: I go to a friend's house and I want to download the game there and log in my own account to show him some stuff, mechanics of the game etc. I'm not giving him my credentials, it's still me using my own account but in a different computer and place.
Well, I'm basically trying to bring some IRL friends to this game and don't want to get in hot water.

From the Codex:
1. Accounting:
a. One account per person, multiple allowed per IP (for multiple people in a household).
b. Having more than one account per person is forbidden.
c. Passing items from one of your characters to another is allowed.
d. Use of another person's account is forbidden.
Thanks in advance!