Henry
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d4 said:...all three-dozen or so WOTC d20 books that i own, from the Player's Handbook to d20 Modern to the Fiend Folio to Dieties & Demigods to the Star Wars Arms & Equipment Guide all have the d20 logo on the back cover.
i'd imagine the BoVD does as well.
You are correct in this. Even though they have the logo, they don't have to abide by constraints of the license, because they are exempt as licensor. Strange, but true.