Björn Persson:

> Does that also apply to licenses that explicitly say how they may be
> combined? Are we supposed to write "GPL-3.0-or-later AND
> GPL-2.0-or-later AND LGPL-3.0-or-later AND GPL-3.0-only" or do those
> still combine into GPL-3.0-only?
 
They don't "combine". The idea that they combine in some sort of logical sense 
regardless of the facts of a given packaging situation reflects a 
misunderstanding of the GPL (more specifically, a misunderstanding of 
FSF-popularized orthodox GPL interpretation). BTW this is also a problem I see 
in the likely use of the old license compatibility chart. 

It is pretty well accepted in the community that you can redistribute 
GPLv2-or-later code as 'GPLv2-only', though this has only rarely been done. 
However, the -or-later form of licensing is basically a kind of disjunctive 
dual license and at least for now we are retaining the existing policy of 
preserving, and noting in metadata, the existence of such an upstream dual 
license, except for the special case of a dual license where one part is not an 
allowed license (with a further preserved exception for Perl GPL|Artistic 
code). 

Richard
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