Industrial standard 3D model

The "licence" such as it is from the website's T&C is:

"User-Supplied Content. The User-supplied models, library features, blocks, and macros are provided for the convenience and information of engineers who are designing products that may use similar models as a component, or use similar features and design techniques. Users may view and download the User-supplied models, library features, blocks, and macros only for such purposes and not to create any competing Internet catalog site or Internet model site. Users may copy and download models, library features, blocks, and macros for model-building purposes provided that Users retain all copyright and other proprietary notices contained in the original Data on any copies of the Data. Users may not modify the Data at this website in any way or reproduce or publicly display, perform, post, transmit, distribute or otherwise use them for any public commercial purpose."

Therefore it's probably not acceptable for kicad to come with a library of models taken from the site. However, given that the authors upload their models for free it seems likely that they could be contacted to ask their permission directly.