ObjectNet is free to use for both research and commercial applications. The authors own the source images and allow their use under a license derived from Creative Commons Attribution 4.0 with only two additional clauses.

ObjectNet may never be used to tune the parameters of any model. Any individual images from ObjectNet may only be posted to the web including… See the full description on the dataset page: https://huggingface.co/datasets/timm/objectnet.