Hi,
There is a difference between using and supplying.
Just because something it is free it does not mean that it can be freely redistributed.
The use of objects and splines is mostly unproblematic, the user just has to know where to get them legally.
However, the distribution of foreign objects and splines is not compatible with German law, unless there is a dedicated permission for distribution from the original author.
Due to the fact that PeDePe GbR is a company in Germany, it is subject to German law. It has happened many times in the past that companies have been fined just for distributing the download link.
German copyright law is one of the strictest in the world. It is primarily there to protect the authors of creative content, which includes OMSI objects and splines as well as maps, and to decide for themselves whether they publish it themselves or have it published by third parties.
For this reason we need the proof that the supplied contents are also allowed to be supplied. As said before: There is a big difference between "use in the map" and "deliver with the map" according to German law. We have to make sure that this is the case.
I hope that you understand our caution.