[theme-reviewers] "GPL 2 or later" and Bootstrap

Chip Bennett chip at chipbennett.net
Tue Jan 29 13:26:12 UTC 2013

"GPLv2 or later" means that a downstream derivative may release under GPLv2
or GPLv3.

In this case, since Bootstrap is licensed under Apache 2.0, which is
compatible with GPLv3 but *not* compatible with GPLv2, the Theme itself
must be GPLv3 (explicitly), rather than the more permissive/ambiguous
"GPLv2 or later".



On Tue, Jan 29, 2013 at 7:53 AM, Kirk Wight <kwight at kwight.ca> wrote:

> Hello all,
> I'm reviewing a theme that includes Twitter Bootstrap, which I understand
> would require licensing the theme as GPL v3. Style.css gives the license as
> "GNU General Public License v2 or later".
> What does that even mean? I know none of us are lawyers, but because of
> the Bootstrap inclusion, should we require the GPL v3 license? And can you
> even start with "v2 or later" and then specify v3?
> Oy, licensing...
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> theme-reviewers at lists.wordpress.org
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