Unclear which license models are released under

[osrf-migration]

Original report (archived issue) by Shane Loretz (Bitbucket: Shane Loretz, GitHub: sloretz).

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It's unclear what the license is for some models. While the Repository has a license file saying Creative Commons Attribution 3.0 Unported, not all models were submitted by the creators.

In particular the grey_wall author isn't the person who submitted it to this repo. Here the author says there is a pull request for DRC with some models. That pull request, which has grey_wall, was submitted by someone else, and it doesn't give a license. I don't see a license file in the DRC repo either. Later it was added to gazebo models in this pull request by a third person.

One way to resolve this is to make every author indicate the license when they make a pull request. Authors could be required to include a LICENSE file in the model folder, or specify a tag in the model.config indicating the license.