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"There are underlying copyrights to the works of Miró, and they are putting it up without having the rights," said Theodore Feder, president of Artists Rights Society. "It's a distortion of the original works and in that respect it violates the moral rights of the artist".
I think they just didn't like the logo and didn't want to let people think Joan Miró had anything to do with it. After all, Dennis Hwang, the creator of Google doodles, is not quite a surrealist painter, isn't he?
More: Mercury News.