And people still ask why anybody wants to use a DRM.....

It seems to me that even if everything which was claimed has happened that way, it is still a very gray area. Was it specified in the contract that incsub are not allowed to use the scripts, and if not will they be able to prove that the videos weren't done while they still had license to use them. In addition, there are not many ways in which you can make a tutorial about creating a new post, so claiming a copy right on every video which describes it is a little bit far fetched IMO.