From Terms and Conditions:
What does W3Creative do to prevent loss or misuse of my information?
Your account information with W3Creative is protected by a password that should be known to you only and should not be disclosed or communicated to anyone. W3Creative will never ask you to mail your password and if you are asked to do so by anyone who might pretend to represent W3Creative, we request you not to provide your password.
It sounds like w3c doesn't care if you give out your password, so long as it does not create legal liability for them. I request anyone knowing of more suitable documentation to bring it forward, but in lieu of this, I request w3c clear up its policies on account sharing.