|Rule 5a) Account Trading or Sharing|
Offering account data to other players, accepting other players' account data or allowing other players to use your account.
You are not allowed to sell your own account or to give it away for free. Vice versa, you must not buy another players' account or accept their account data. This also includes not to accept or give away accounts as a present. Each account is assigned to one person only and this person may not pass on the account to somebody else. Statements like, e.g. "I'm selling a level 30 knight", "I trade my sorcerer for a druid" or "I'm buying a paladin" - whether in the game or on a website - will lead to a punishment of your account. The same is true for a comment like "New Owner" on your account or character information.
An account should always be used by one person only. Only the person that created an account is allowed to use it. It is unfair towards other players if a group of several people shares one character e.g. to be online 24 hours a day. Moreover, you will be held responsible for everything that happens on your character. So if your brother violates a Tibia Rule with one of your characters while you are in the bathroom, you will have to deal with the punishment.
Sharing your account data with another person is not only against the rules, but also a high security risk for your account. It is actually one of the most wide-spread reasons why a player loses his account. What if you suddenly got into a serious argument with a person that you consider your friend and who you are sharing your account with? Or what if one of your friends suddenly decides that he would like to play your shared character alone and takes over your account before you can react? Account sharing is not worth the risk, which is why you should never do it. Besides, it can as well lead to an account punishment.