HarryT's interpretation of this ruling is incorrect. By "all editions" it means that all ebook editions have some sort of software protection, that no "copies" are available without the protection. Since this is generally the case for DRM protected works, this ruling pertains.
Also, kovidgoyal is incorrect in his understanding of the ruling: it does indeed mean that the tools to circumvent will also fall under the ruling, since these tools themselves are not illegal because of the exemption.
The key to understanding the ruling is that you are free to circumvent the key only for those books you legally purchased. The new exemption is directed squarely at the ereader platform dilemma: by attempting to lock down a legally purchased book to a single platform, companies like Amazon, Sony, and Barnes & Noble are clearly attempting monopolistic practices and hindering the open marketplace. This is what the exemption is attempting to address.
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