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If the Kindle TTS is disabled the copyright holder has explicitly chosen to do so and it is reasonable to assume that all other ebook versions also have TTS disabled. So, absent information about "authorized entities" (who make ebooks available to the visually impaired), this exception does apply at a minimum to removing the DRM for TTS on the Kindle. To me, if you want to use the Kindle'sTTS and are prevented from doing so you are adversely affected. Re-enabling the Kindle's TTS involves leaving the encryption in place and deleting one entry in the metadata. This is minimal intrusion on the DRM, and so far as I can tell entirely legal for personal use in the US. Actually, there is no possibility of non-personal use since the ebook is still tied to a single Kindle by the DRM.
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