I have read the T&C for SketchUp and see that it specifically states that I must get permission before using a model made by someone else. I understand this. I am publishing a paper in which I have a screenshot of an assembly I made with multiple assets I found in the 3D Warehouse. Does an image of the models still require permission from the creator of each asset I use? I have modified some of the models, would I be able to use those since they are now my models? If I cannot use the models unaltered, would I be able to just draw out my screenshot by hand?