ALA Sends "Cease & Desist" Letter to Audible.com

As a follow-up to the earlier-mentioned Audible's "Don't Read" Campaign, Library Journal reports that the ALA has sent a "cease and desist" letter to Audible.com about the ads, as featured on dontread.org. (Apparently the legal advice in the previous LISNews story went unheeded!) Is this a case of obligatory trademark protection, or playing in to their publicist's hands while lowering people's image of librarians?