docs(license): update LICENSE.txt

[zeroshade]

Rationale for this change

Fixes #275

What changes are included in this PR?

Removing "safe-math" from being vendored as it's no longer being used. Updating the LICENSE.txt with all appropriate information including files which contain code that has been copied from other projects.

[zeroshade]

CC @jbonofre @jas4711

Please take a look and confirm if I missed anything, thanks!

[jas4711]

Thank you! Looks good to me, even though it does not add any copyright notices for ASF. I was expecting something like:

Copyright (C) Apache Software Foundation

Is there any reason you do not want this to be in the git repo? I don't care strongly about legal reasons here, but there is a lot of license scanners that search for 'Copyright' as a string to find licenses and authors. It would have saved me some uncertainty when trying to figure out Debian's debian/copyright file for this package if there were more clear copyright notices pointing at the ASF. Sometimes the exact legal name is significant too.

[zeroshade]

The NOTICE.txt file contains the line Copyright 2016-2025 The Apache Software Foundation and the heading of every source file has the standard Apache License which includes See the NOTICE file distributed with this work for additional information regarding copyright ownership.

In addition every source file heading starts with Licensed to the Apache Software Foundation (ASF) 😄

Is that sufficient?

[kou]

+1

In general, ASF projects write "Copyright YYYY The Apache Software Foundation" in NOTICE not LICENSE.

See also: https://infra.apache.org/licensing-howto.html#step-by-step

[jbonofre]

Thanks ! As you removed safe-math, the LICENSE doesn't have to be updated.

About the code copied from LLVM, it's OK in the LICENSE and no need to update NOTICE as LLVM doesn't provide a NOTICE.

The dependency copyright doesn't have to be in NOTICE (NOTICE is to host relevant information from dependency NOTICE).
The copyright should be in LICENSE with the code copied (similar to https://github.com/apache/arrow-java/blob/main/LICENSE.txt#L211).

On the other hand, the project copyright should be in the NOTICE, and we are good here:

Apache Arrow Go
Copyright 2016-2025 The Apache Software Foundation

This product includes software developed at
The Apache Software Foundation (http://www.apache.org/).

So, @zeroshade you are good here ! Thanks !