I plan on making a large fictional futuristic city tram route that takes place on a fictional group of islands. I have a few questions about using kuids of other creators as dependencies. For example, when uploading a train to the download station, I can reference a cab someone else created as a dependency, as I understand it. Does this rule change when the content you're making is payware? When testing the upload process with a smaller route I was working on, it said to include .cdp files for things that aren't on the DLS, which implies anything on the DLS is fine, but I've also come across content that says in the description or in the license that they can't be included as a payware object. What exactly are the rules with this? As well as with built-in objects?