Z:gnu-www-ja-rms-why-gplv3--13edc8-When we say that GPLv2 and GPL/en

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, &ldquo;If you include code under this license in a larger program, the larger program must be under this license too.&rdquo; 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.