I have never found anyone who has drafted the rules of this forum in downloadable PDF format, but don't worry you can always read the rules that apply easily because the forum rules that must be obeyed have been pinned on the beginner's and help board by the moderator.
Because forum rules can be updated with time.
The topic
Unofficial list of (official) Bitcointalk.org rules, guidelines, FAQ writes that rules are officially applied but that list is unofficial one.
Theymos is flexible and can change rules when he sees it's good to make changes. Forum global moderators and admins have their own interpretations, case by case, when applying rules.
23. When deciding if a user has broken the rules, the staff have the right to follow their interpretation of the rules.[e]