At Eclipse Update manager install time, you only see the license in features/*/features.properties.
From Help > About Eclipse Platform, you can see the v21 feature, and its plugins. The license info you get is a link in the browser to the ASL 2.0 license. Ideally, you would get the LICENSE.txt and NOTICE.txt information. For the plugins, there is no legal info link.
From Help > Software Updates > Manage Configuration, you only see the license in feature.properties, not the notices, and the "see in browser" link is not active.
Based on the info in http://www.eclipse.org/legal/guidetolegaldoc.php, these items may be nicely addressed.