#12447: update the file COPYING.txt
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Reporter: jhpalmieri | Owner: tbd
Type: defect | Status: needs_work
Priority: critical | Milestone: sage-5.10
Component: packages: standard | Resolution:
Keywords: COPYING.txt license | Work issues: fix COPYING.txt
Report Upstream: N/A | Reviewers:
Authors: | Merged in:
Dependencies: | Stopgaps:
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Comment (by jdemeyer):
Just arrived on this ticket by chance. Yes, it looks like something which
should be fixed.
> Currently it says that everything in Sage is GPLv2+-compatible, which is
wrong.
No, it's correct but misleading. If licences A and B are ''compatible'',
it means that it is possible to combine those software packages under
''some licence''.
To put it mathematically: let `A` be a licence. Let `L(A)` be the set of
possible licences under which code from licence `A` can be released (for
example, if `A` is `GPLv2+`, then `L(A)` contains `GPLv2` and `GPLv3`).
The statement "`A` and `B` are compatible" means that the intersection of
`L(A)` and `L(B)` is not empty.
Sage as distribution is released under `GPLv3`, which is
`GPLv2+`-compatible.
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/12447#comment:6>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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