Z:gnu-www-ja-license-list--4ab251-This is a free and copyleft li/en

This is a free and copyleft license meant for data. It is incompatible with the GNU GPL. Please don't use it for software or documentation, since it is incompatible with the GNU GPL and with the GNU FDL. It makes inconvenient requirements about signing contracts which try to create an effect like copyleft for data that is not copyrightable, so we don't recommend using it; however, there is no reason to avoid using data released this way.