Z:gnu-www-ja-why-copyleft--2d7514-In the GNU Project we usually/en

In the GNU Project we usually recommend people use copyleft licenses like GNU GPL, rather than permissive non-copyleft free software licenses. We don't argue harshly against the non-copyleft licenses&mdash;in fact, we occasionally recommend them in special circumstances&mdash;but the advocates of those licenses show a pattern of arguing harshly against the GPL.