In some shops the creative brief is simply an internal working document that helps focus the creative process. Creative briefs don't necessarily need to be printed since they can be viewed online by anyone with access to job tickets. No, it's a user access privilege. Anyone with access to edit a job ticket can edit the creative brief. Users with view-only access to job tickets can see it, but can't make changes.
Creative briefs have eight sections, each with user-defined headings and descriptions.
It's usually account executives since they're the ones who are closest to the client. Only the section headings can be changed.