Z:gnu-www-ja-gpl-faq--c50212-Yes, you do. =26ldquo;Fair use=26/en

Yes, you do. &ldquo;Fair use&rdquo; is use that is allowed without any special permission. Since you don't need the developers' permission for such use, you can do it regardless of what the developers said about it&mdash;in the license or elsewhere, whether that license be the GNU GPL or any other free software license.