Thanks for the response.
However the reasoning is still unclear.
Itunes is sending the video to Apple TV correct?
Are you saying Plex on Apple TV is pulling the video content?
It is not clear in your answer just how Plex differs from iTunes when it comes to sending content to the Apple TV.
In any regard, I dug deeper. Here is what Plex has to say:
"Well, you need to understand how search works. On Android, search works by providing a hook to every app installed on the device so that it can participate. When the user searches, the search term is given to the locally installed app. This makes it easy for us to participate and return your local search results. On Roku (and a few other platforms, this is the more common design), search happens in the cloud. The search term is sent to Roku's server, where it performs the search and returns results. To participate in this search, you partner with Roku and essentially provide an index of available content. In particular, this is what allows Roku to return search results even for channels that you don't have installed on your Roku.
So, how would we participate? There are two obstacles to this approach. First, we would need an index of every user's media up in the cloud. We very specifically do not have such an index. If it were going to happen, it would have to be on some sort of opt-in basis, but I'm not sure we'd be excited about even that if you want my personal gut reaction. But suppose that we did have such an index, just for the sake of argument. The second obstacle is that we'd need a way to correlate a particular Roku search with only your media in the index and not everyone else's. I'm not 100% sure on this, because we haven't really had a good reason to verify it, but I don't think that's currently possible."
Plex
I realize the above uses Android as the example.
However based on how the roll out of Universal search is working, It would seem that Apple is using a cloud based approach to Universal Search.
It appears Plex keeps a local database that is uses to search for local content when using the voice search feature on Apple TV.
So the point on how no two people name the file the same way is irrelevant.
You went a little too far with this comment:
That's pure speculation.
On a side note, it is not illegal to rip DVDs in all countries.
DVD for Backup and Private Use