Wednesday, 2020-02-19
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| gry | what is the shortest, most robust copyleft licence? | 23:08 |
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| bkuhn | Not sure what you mean by "robust" in this context. | 23:13 |
| bkuhn | if you mean, "sure to protect your software freedom", that's going to be a trade-off with brevity. Non-copyleft licenses are shorter because they have "less work" to do as they don't go to effort to assure software freedom downstream. | 23:14 |
| gry | is gnu gpl the only licence in the world which assures software freedom downstream? | 23:22 |
| bkuhn | Only a strong copyleft license attempts to assure that. GPL is one form of a strong copyleft license. | 23:25 |
| bkuhn | It's the canonical example, certainly. | 23:25 |
| bkuhn | I think copyleft-next does a pretty good job too. | 23:25 |
| bkuhn | Remember that copyleft doesn't grant certainty -- copyleft licenses have to be enforced to succeed. | 23:25 |
| bkuhn | so how enforcement and how successful enforcement is likely to be are also factors on whether or not software freedom is assured. | 23:26 |
| gry | what other strongly copyleft licences exist, other than the gpl? | 23:26 |
| bkuhn | Other than the GPL itself, or the GPL family? | 23:26 |
| bkuhn | besides GPL family, there's copyleft-next, the old sleepcat license is basically a strong copyleft (although it was designed for proprietary relicensing and therefore really wasn't designed for software freedom assurance), some argue that the EPL is a strong copyleft, although I think that's debatable. | 23:28 |
| gry | other than the GPL family | 23:28 |
| yrk | gry: a list of free software licenses, some of which are copyleft: http://www.gnu.org/licenses/license-list.html#GPLIncompatibleLicenses | 23:30 |
| gry | why are you linking to the "incompatible licences" section here? | 23:31 |
| bkuhn | It's typical that two copyleft licenses that approach copyleft from a different method are highly likely to be incompatible with other copyleft licenses. | 23:32 |
| bkuhn | It's sort of the *point* of copyleft: the goal of copyleft of course is to make the license "incompatible" with proprietary licensing, so a strong copyleft license requires a term that says something like: "works based on this must be under this license [ and only this license]" | 23:33 |
| bkuhn | ... when a license says that, it's really tough to make other licenses compatible. | 23:33 |
| bkuhn | typically different copyleft licenses are made compatible with each other by dual licensing. | 23:33 |
| bkuhn | "made compatible" should be in quotes -- dual licensing uses a meta-license to give downstream a choice between two copylefts or to continue the choice further downstream. | 23:34 |
| gry | the only one which seems copyleft is https://directory.fsf.org/wiki/License:Xinetd | 23:40 |
| gry | in that lsit | 23:40 |
| gry | interesting | 23:40 |
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