Github user mwpenny commented on the issue:
https://github.com/apache/zeppelin/pull/1210
@corneadoug, The Esri angular module is used to download and lazy load the
JS API and require its various classes. These classes are then used to display
the dynamically downloaded map tiles and render the different map layers (i.e.,
basemap + pin layer).
The angular module was developed by Esri and released under the Apache 2.0
license. They state on their website that ["The JavaScript API [downloaded by
the angular module] is hosted by Esri and is available for free
use"](https://developers.arcgis.com/javascript/3/jshelp/intro_accessapi.html).
Esri also has a public Apache 2.0-licensed repo of samples
([Esri/quickstart-map-js](https://github.com/Esri/quickstart-map-js)) which use
the API.
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