On 7/29/07, Alec Mihailovs <[EMAIL PROTECTED]> wrote: > > From: <[EMAIL PROTECTED]> > > > > > Not always so. Verbatim snippet from the horse's mouth: > > > > > > "When we say that GPLv2 and GPLv3 are incompatible, it means there is no > > legal way to combine code under GPLv2 with code under GPLv3 in a single > > program. This is because both GPLv2 and GPLv3 are copyleft licenses: each > > of them says, "If you include code under this license in a larger program, > > the larger program must be under this license too." There is no way to > > make them compatible. We could add a GPLv2-compatibility clause to GPLv3, > > but it wouldn't do the job, because GPLv2 would need a similar clause. > > > > Fortunately, license incompatibility only matters when you want to link, > > merge or combine code from two different programs into a single program. > > There is no problem in having GPLv3-covered and GPLv2-covered programs > > side by side in an operating system. For instance, the TeX license and the > > Apache license are incompatible with GPLv2, but that doesn't stop us from > > running TeX and Apache in the same system with Linux, Bash and GCC. This > > is because they are all separate programs. Likewise, if Bash and GCC move > > to GPLv3, while Linux remains under GPLv2, there is no conflict." > > > > http://www.gnu.org/licenses/rms-why-gplv3.html > > Well, I wouldn't call SAGE a single program.
The issue is complicated, and I doubt a lawyer would agree. Besides, that's exactly what > commercial CAS's do. In particular, Maple includes gmp and a series of other > programs under separate licenses. gmp is licensed under the GNU LGPL, which is GPL without the linking requirements, so Maple can do what they want, as long as they don't modify GMP. If they modify GMP, then they have to publish their changes under the LGPL, but they can leave the maple core alone. > > Alec > > > > > -- Bobby Moretti [EMAIL PROTECTED] --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to sage-devel@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://sage.scipy.org/sage/ and http://modular.math.washington.edu/sage/ -~----------~----~----~----~------~----~------~--~---
