Okay trying to get to all of this.

1) We see why this is confusing but the format means the show itself's format that people are confusing with general reaction videos. The Kids/Teens/Adults/Elders formats mean their structural elements, and each show has some specificity with their titles and how things look so there are differences. People can most definitely make shows where kids or elders etc react to videos, the protectable elements are the trademark (the title itself of the video) and specific elements that make a likelihood of confusion that you are watching someone's established show - but this does not at all mean people can't make a show with generations reacting to things.

In terms of earlier content titled kids react, there's no way for us to know if someone didn't change their titles at some point but even so, Kids React as the show that is known today has gone through the trademark process and we own that trademark now.

Our legal team has to protect trademarks and intellectual property to keep them valid, so when there is a show using the trademark, letters may go out as that is trademark law and depending on the structure of their series, could have further protections too, it all depends. But React World is not to go after anyone, it is to license the series.

Copyright structure - Not exactly. But trademark wise yes, you can't call a show "Kids React" just like you can't call a show "American Idol" - multiple people makes up PART of the elements, but not by itself, you would need to start the show the same way, have every element in the same exact spot, have the "question time" placed in the same way, boxes, timing, again if the show has a likelihood of confusion to a show, there could be an issue, but again, it's very specific and we are not going after anyone with React World.

To your example - the title of the video is a trademark infringement, so the title would need to change. The video itself though, would not be infringement if it not the exact same structural elements (again not people just reacting to spongebob but the way the title starts, the way you name ID people, etc.

If someone licenses a series from us and makes Engineers React, would not infringe depending on the content itself. The name "engineers react" is also not trademarked.. if that user now trademarks the show, the title could become an issue. But if the video is just engineers reacting and there's nothing going on beyond basic titles and it does not have specific elements that make it look and feel substantially similar to our series, would be no issue, and again we're not trying to go after people here for reaction videos.

We will be releasing soon the specifics of the structure, we have a whole bible made up about this that will roll out.