There's a PR open to fully update our LICENSE and NOTICE file to fix some omissions and bring it in line with best practices: https://github.com/apache/spark/pull/21640#pullrequestreview-131808865 I've summarized some of the issues and links to key reading.
It's worth a quick look to ensure we're all aware of what these files are for, when they have to be updated, and the conventions used at the ASF. Thanks! Sean
