1. Status : Duplicate
This status must be given to the ideas which seems to be a duplicate of existing idea. In this a link to the original idea may be generated in the comment section of the duplicate one.
I have seen comments saying "Its a duplicate one". Rather than writing a complete comment its better just to display its status as duplicate and referring it to the original one.
2. Status : Deleted
This status must be given to the tutorials which is been copied from some other source as it is
and say the user has not given any credit to the original post by referring to it(or mentioning its link).
The contents of the tutorials must be replaced by a warning message.This is in reference to comment made by @remoulder in the comment section of This Idea