From Rigs of Rods Wiki
This page exists as a clarification for the following rule:
When creating or modding:
- You may freely use your own creations (of course).
- You may use the RoR creations of others if the original author approves (they may give a blanket statement (You may mod this as you wish..) or permission might be granted on a case by case basis) and credit is given.
- You may freely use third-party creations (e.g. SketchUp, etc) as long the original authors and/or copyright (or other licenses) allow for such use, and you give credit.
Also you must be able to verify that you may use 3rd party material. If the original author stated nothing about copyright, then you must ask him!
Why do these polices exist?
If someone were to steal copyrighted work (for example: a Need for Speed 3d model) and used it in RoR/uploaded it to the forums or repository, then the author/copyright holder (in this example, Electronic Arts) could sue the RoR website for copyright infringement. Such a lawsuit would likely be quite costly, and possibly spell the end of RoR. It is therefore imperative that all copyright regulations be followed.
If you are caught stealing copyrighted materials you will be punished accordingly. It may lead to you being banned from uploading content to the repository, or banned completely from the RoR website. Copyright violations are considered serious rule breaches and are not to be taken lightly.