I really don't favor this, although I completely understand that they would want to prevent it being exploited in political advertising. Ironically, keeping King's legacy behind a paywall exacerbates the the very inequality he deplored and limits public access to an understanding of his ideas in the round. So instead we get smarmy politicians that exploit 1 or 2 particularly famous lines of his to shut down rather than open up discussion. By selectively quoting him, they inoculate themselves from criticism, suggesting that attacks on the politician's character or policies are actually attacks on the MLK lapel badge they are (metaphorically) wearing.
