Hey @Halinh
2. Each person is allowed a maximum of four owned accounts.
This includes, but is not limited to:
Any account created counts towards your 4 total, not just active ones. 0 hours, 0 badges, never played on? They count.
Received accounts, count towards your total.
Given away accounts, do not count towards your total anymore.
Received/Given away only count if you changed the password/email of said account otherwise it still belongs to the original creator
Exploiting more than 4 allowed accounts in order to gain mass profit or frequently gaining large amounts of income. If someone has quit PRO and gave their account to you, take anything you want at once and stop using it only if you already own 4 accounts. Be aware doing this may trigger a ban in which you will need to appeal and provide proper evidence of the account being given to you.
(Example: Having the password of more than 4 accounts you received by people who are inactive in order to fight bosses, doing PvE quests to receive rewards, or progressing during a Special Event in order to receive one time rewards such as Reroll Tickets, etc...)
Hope this helps and no, its not a violation to help your friend.
Accounts shared with you do not count as one of your 4 accounts unless you are given full ownership of said account.