Adjust license to reflect a MIT-only source, and add a MIT license file

[musicinmybrain]

Since entropy_encode.rs appears to be derived from https://github.com/google/brotli/blob/v1.1.0/c/enc/entropy_encode.c (possibly at a different version), and carries only MIT terms, it’s not possible for the crate to be BSD-3-Clause OR MIT overall. The new LICENSE.MIT file is taken from
https://github.com/google/brotli/raw/refs/tags/v1.1.0/LICENSE since that appears to be the correct license text for entropy_encode.rs.

Fixes #41.

It would be great to have some kind of resolution to these licensing issues.

[musicinmybrain]

The corresponding PR for rust-brotli-decompressor is dropbox/rust-brotli-decompressor#32.

[nyurik]

Shouldn't there be another line copyrighting @danielrh and possibly myself (lots of rewrites thereafter) as part of the MIT work?

[musicinmybrain]

I don’t personally have enough insight into the development of this project to know who did what and under what terms, but you should certainly use your knowledge of that history to try to make this more accurate. Speaking as not-a-legal-expert, I don’t see any reason not to add additional copyright statements to the MIT license file, as long as you preserve the original one. I’ve seen that done pretty often. I guess you could also choose to have your own separate MIT license text in one file, and maintain a second MIT license file to cover code derived from https://github.com/google/brotli/.

In any case, whatever you end up deciding to do here, you should probably do the same thing in https://github.com/dropbox/rust-brotli-decompressor.

Thanks for following up on this!