Consider recoloring CC0 license and adding 0BSD

[xuhdev]

Are you experiencing an issue with...

shields.io

🐞 Description

Neither Free Software Foundation nor Open Source Initiative recommend releasing software under CC0 due to patent grant issues, and only Free Software Foundation considers CC0 as a free license. However, it is currently being colored as the least restrictive. The license is controversial at best.

One real no-attribution license in the software world is 0BSD, which is not included by shield.io.

🔗 Link to the badge

No response

💡 Possible Solution

Recolor or remove CC0, and add 0BSD to the public domain color list.

[calebcartwright]

Thanks for reaching out. I confess my initial reaction seeing this is the typical "I'm not a lawyer, I don't even want to pretend to be able to adjudicate open source licenses", but I also fully recognize the badge coloring is, to an extent, already doing just that.

I'll be curious to hear thoughts from other maintainers, but I think there's two separate items here: the addition of 0BSD which should be fairly noncontroversial, and potential changes on CC0 which will have some level of blast radius consideration and controversy

[xuhdev]

Yeah I agree regarding CC0. That's exactly why I put the opinions of Free Software Foundation nor Open Source Initiative in the original post, not my own opinion 😉

[chris48s]

Broadly speaking, I'm against us just freestyling this and making our own judgements.

Looking over the comments in https://github.com/badges/shields/blob/master/services/licenses.js and the discussion in #1190 it seems that we're mostly deferring to choosealicense.com on this.

Looking over the table on https://choosealicense.com/appendix/ and http://landley.net/toybox/license.html I agree with adding 0BSD to this category 👍

On removing CC0: Badges are not only for software projects (although I acknowledge that is the primary use). Data projects can use badges too. You can use one on your eBook if you want 🤷
I'm not sure I necessarily love the fact that we've decided to apply semantic colours to licenses, but given is where we are starting from, I don't think "suitability for software projects" is one of the characteristics we've attempted to encode. "CC-BY-SA-4.0" probably isn't a great license for software, but we still code it as "copyleft".
I think I am 👎 on removing CC0 from the "public domain" group. Even if it is not advised for software, it is still a public domain license.

[jNullj]

Change is available for merge in PR #10092
Added 0BSD to the public domain type (and spec test)
Also noticed we can add 0BSD in PyPi License service helper, as PyPi is not using the short spdx name but a longer format. So added that as well.