Question Regarding the usage rights of the Unity default assets

Greetings,

I was wondering what the usage/attribution/cc rights are regarding Unity's default assets, specifically Unity's URP default SampleScene assets.

The reason I ask is that for a simple university assignment involving placing arbitrary objects in the scene, I had submitted unity's URP sample assets from the sample scene.

The instructions indicated that citations would need a URL. However, since the sample assets are distributed across URP/HDRP distributions (with no strings attached, to my knowledge), rather than a URL, I indicated that the source was from the default starting scene.

Now that I had submitted the assignment, I am now concerned if it is at all possible for this to be used as grounds for a charge of academic dishonesty (plagiarism).

In the past, in the assets I have worked with (such as VFX Graph, URP, etc) I was told that the assets distributed by Unity as part of samples or standard assets can be used by developers as they see fit.

Perhaps I am being too cautious, but I would like to confirm.