On Tue, Feb 21, 2017 at 1:49 AM Marvin Humphrey <mar...@rectangular.com> wrote:
> On Mon, Feb 20, 2017 at 10:47 AM, Mike Jumper <mike.jum...@guac-dev.org> > wrote: > > AFAIK, only the copyright holder can relicense a copyrighted work, > whereas > > others may sublicense under compatible terms so long as the original > > license grants that permission (ie: the license of the original work is > not > > actually changing). > > > > Is that not correct? > > Correct, and well said! > > When we assert that an Apache release package is available under the > ALv2 even though it bundles BSD-2-clause licensed code (as is the case > with MADlib), we are suggesting that the ALv2 "subsumes" the > BSD-2-clause license -- that fulfilling all the requirements of the > ALv2 suffices to fulfill all the requirements of the BSD-2-clause > license. > > This is sometimes called "sublicensing", and it only works in one > direction: a license with more restrictions can subsume one with > fewer, but not the other way around. > > In contrast, "relicensing" is usually taken to mean the original > copyright holder granting an *additional* license of any type. For > example, if you're the copyright holder, you can take something which > is available only under a proprietary license and make it available > under an open source license. Or you could take something available > under the GPL and make it available under the ALv2. > > (Of course the difficulty of "relicensing" in the context of open > source is that there may be many copyright holders who need to > participate in a relicensing effort -- and if you can't get them all > on board, you might have to strip out and replace code that couldn't > be relicensed.) > > For more information on combining software under multiple open source > licenses, I like this article by Luis Villa: > > > https://opensource.com/law/11/9/mpl-20-copyleft-and-license-compatibility > > This is outdated but still a good read: > > http://www.catb.org/esr/Licensing-HOWTO.html#compatibility > > Marvin Humphrey > So are we saying that the code modifications are sub-licensed? Or re-licensed? > > --------------------------------------------------------------------- > To unsubscribe, e-mail: general-unsubscr...@incubator.apache.org > For additional commands, e-mail: general-h...@incubator.apache.org > >
