updating license for python module to LGPLv3

[jacobagilbert]

This specifies the LGPLv3 License for the python module instead of the unsuitable CC license the spec uses. It is not ideal to have the spec and python code in the same repository under different licenses, but that will be addressed post v1.1.0 release when they are split into their own repos.

Closes #254

DONT MERGE for now.

[bhilburn]

I'm good with the LGPL license, but the header swapped in to the code files in this PR is actually the GPLv3 header, not the LGPL header?

[jacobagilbert]

Thanks @bhilburn you are correct - I got this notice from here but failed to read the entire section 🤦.

I switched to the SPDX License Identifier for simplicity which should resolve this annoyance (and less text)

[jacobagilbert]

I think this is mergable, but no real rush. Removing the DONT MERGE label.

[bhilburn]

@jacobagilbert - I see that you changed it to an SPDX identifier, but it looks like you used the GPL string instead of the LGPL string?

SPDX-License-Identifier: GPL-3.0-or-later

[jacobagilbert]

Good grief. Sorry, thanks Ben - FIXED!

[dkozel]

I agree with LGPL being a reasonable license for a reference implementation of our open spec. The compelling immediate desire is to increase the usage of the open SigMF file format over proprietary or less useful formats, not to compel users of the SigMF file format to release their higher level applications.

Just a note, there is no GNU Radio Foundation to hold the copyright. Nor was their in 2021... "GNU Radio project" could be used (though technically I don't think the project can hold copyright since it isn't a formal legal entity). But as intent is a big part of court interpretations of copyright cases I'd still go with "GNU Radio project". @bhilburn?

[jacobagilbert]

Yeah, I assume that is just boilerplate that got copied as the module expanded...this is probably a good time to get that correct as well. This project has never required copyright assignment either, so its not clear what we can/should do regarding that notice.

@bhilburn i think you are the expert opinion here :)

[bhilburn]

Great catch, @dkozel.

Making it "GNU Radio Project" communicates intent, but also indicates assignment, which as @jacobagilbert notes, we have never / will never do.

Just make it "Copyright Multiple Authors", which is fine

[jacobagilbert]

OK, thats better. Thanks!

[jacobagilbert]

I think this is ready. If I can get a few final reviews ill merge ahead of a release.

[gmabey]

Looks good to me,