Until now, when I saw content that was simply copied from the web without an attribution, I flagged the respective posts for moderator attention, and moderators always deleted them -- in accordance with e.g. this comment by random.
The last time I flagged such a post, the moderator declined the flag with the comment "copyright infringements and other legal matters are out of our domain of moderation; also see http://stackexchange.com/legal", and no further action was taken. The linked page details StackExchange's terms of service, including a lengthy procedure how to report copyright infringements.
So I'd just want to make sure there is no misunderstanding on my part: if there is a some post that is a verbatim copy from the web without any attribution, I shouldn't flag for moderator attention, but I should rather apply aforementioned lengthy procedure. Correct?