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License headers and NOTICE file


I am looking at sorting out our license headers and NOTICE file.

For license headers the only real question I have at this point is
https://github.com/apache/incubator-druid/issues/5835#issuecomment-404257393.
If anyone with experience in this sort of thing could chime in then that
would be very useful.

For NOTICE, it looks like
http://www.apache.org/dev/licensing-howto.html#overview-of-files governs
what the NOTICE file should contain. Here is our current one:
https://github.com/apache/incubator-druid/blob/master/NOTICE. It has the
following features,

1) Copyright notices up top for three major contributors.
2) A notice for each project where we've copied code directly into the
Druid codebase. They're all Apache licensed.

>From reading the licensing-howto it seems like the file needs some tweaks.
A bolded principle in the guide is "Do not add anything to NOTICE which is
not legally required." The copyright notices for major contributors don't
seem necessary given they are all covered by SGA / CLAs. The howto also
says "If the dependency supplies a NOTICE file, its contents must be
analyzed and the relevant portions bubbled up into the top-level NOTICE
file." We haven't been doing that -- we have just been listing the projects
themselves.

For projects where we've copied code, and for which those projects don't
have a NOTICE, should we remove them completely from our NOTICE? And I
suppose we should double check that we have source files marked
appropriately in cases where they're copied from another project.

Is there anyone with more experience in writing NOTICE files that could
chime in with thoughts please?