License and copyright

[lassik]

Files with Dime prefix

• dime-browse.el -- good authorship info, GPL version 2 or later.
• dime-note-tree.el -- who wrote this? GPL version 2 or later.
• dime-repl.el -- file says main author is Helmut Eller, GPL version 2 or later.
• dime.el -- file lists several authors, GPL version 2 or later.

Files with Dylan prefix

• dylan-lid.el -- file says it's written by Erik Charlebois, GPL version 1 or later.
• dylan-mode.el -- good authorship info, GPL version 1 or later.
• dylan-optimization-coloring.el -- no license info at all, git log shows it's mainly Hannes Mehnert's work.

[cgay]

@hannesm can you comment?

[hannesm]

I do not remember the exact circumstances (git log / blame should be able to discover where the files originate from). I'm fine with any license (being it ISC/BSD or GPL) for the code I wrote, whatever is preferable to have a single license in this repository.

[lassik]

If we desire a common license for all this code, GPL-2.0-or-later would be the simplest choice. To the extent that we know the current licenses, we have some GPLv1 code, some GPLv2 code, and no GPLv3 code.

[lassik]

The Dylan compiler seems to use a MIT/BSD style permissive license. Like Hannes, I'm also fine with a permissive license for any code I write. However, it may be hard to track down all the others, so sticking with GPL would be simplest.

[lassik]

@cgay @housel What do you think of using GPL2 for everything?

[cgay]

I prefer MIT in general but have no problem with GPL2 for the elisp code if it's simpler.

[lassik]

All the files now have SPDX-License-Identifier: saying GPL, and there's a copy of GPL 2 in the LICENSE file.