90秒で分かるクリエイティブ・コモンズ (CC) っていったい何?

著作権に関連したクリエイティブ・コモンズ(CC)。画像素材サイトなどで目にしたことがある人も多いかもしれません。CCが何なのかを90秒で理解しましょう!
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