Probably freely distributed (at lives?) Details unclear.
KALEN (カレン)'s eternity... is a slightly (very slightly) different version of the song that appears on their 「flow~」 maxi-single. ET CETERA (エトセトラ)'s track is the same recording as the PV version, but with only one channel of audio.
My version of this CD comes with a extra paper that looks like a front cover, having the title "INDIES BAND SAMPLER CD"