Hi Chris,

Anne is correct that for DRM protected ePub books that use Adobe's ADE scheme, 
which is the most common commercially used DRM scheme, you have to use Adobe 
Digital Editions Preview to read the books.  This is the DRM scheme used by 
Kobo, Barnes and Noble, Sony, and Google, along with many online bookstores 
that sell ePub books with DRM.  In the case of hardware devices from Kobo and 
Sony, and the Barnes and Noble Nook, all of which I believe lack accessibility 
for visually impaired readers, these DRM-protected ePub files will also be 
natively supported on the readers.  This format is also used by libraries for 
downloadable eBooks that can also be downloaded in the free OverDrive Media 
Console app for iOS.  

Apple's iBooks uses a different DRM scheme called FairPlay2, and there is 
currently no program that supports reading those files on a Mac.

Adobe Digital Editions Preview is quite comfortable to use for reading if you 
don't need to use features for closer examination of the text, such as reading 
by character, or reviewing by line, etc.  If you're trying to learn computer 
coding, where variables can be oddly spelled, and you need to check for special 
characters, delimiters, and spacing, there's currently no good reader that 
supports those features and also handles DRM that you can use on your computer. 
 You have to use work arounds like using the VO-Shift-C to copy the page that 
VoiceOver read to the clipboard, and then paste that section into TextEdit 
where you can use all the regular VoiceOver navigation and reading options to 
review the material.  I prefer reading library downloads with Adobe Digital 
Editions Preview on my Mac to reading the same downloads in OverDrive Media 
Console on my iPhone, though it's neat that I can browse and borrow through the 
OverDrive app on my iPhone or iPad once I've linked it to my library user 
account number.  OverDrive on iOS is much better for audio book downloads from 
my library than it is for reading downloaded eBooks.  Similarly, I can open 
ePub books with ADE DRM in the OverDrive app on my iPhone, but the reading 
experience isn't as good as with the Kobo app or Adobe Digital Editions Preview 
on my Mac.  Basically, I'm only covering these details for completeness.

Stanza desktop (to distinguish it from the iOS Stanza app that it was developed 
to support) works for multiple eReader formats, including ePub, provided these 
do not have DRM.  However, it was originally developed mainly as a tool to 
unify the diverse set of mobile reading file formats, so that a supported 
standard, ePub, could be used with the iOS Stanza app.  As such, it was 
primarily a desktop conversion tool that was adapted to also use as a reader 
and to support various upload options for the Stanza app.  However, since 
Stanza is accessible with VoiceOver, and the other main eReader conversion 
tool, Calibre, is not (at least, not in its GUI interface -- you can run it 
with AppleScripts from Terminal), many blind readers are using it also as a 
reader.  (In case you are interested, the iOS app can be used with VoiceOver 
and even with Braille devices, but is basically no longer supported, since 
Amazon bought out the competition.  At one time Stanza on iOS devices was 
deemed the biggest challenger to Amazon's Kindle, and was backed by publishers, 
lead by MacMillan, to be the standard distribution tool for eBooks.) 

Stanza on the Mac is free and usable, but it has some focus quirks with 
VoiceOver for its advanced functions, such as bookmark navigation. Just use the 
navigation controls you would use for HTML content, and you can use all the 
heading shortcuts, etc.  It does let you read by word, character, etc. Other 
accessible apps for DRM-free ePub reading on the Mac are iText Express or Pro 
(from the App store -- the Express version is free), and Bookle ($10 in the App 
Store), which is an app that the editors of the Take Control eBook series 
recently developed.  They're still adding features, so I'd like to see support 
for more navigation options, but this is coming along, and uses a library 
organization to keep track of your books, as does Adobe Digital Editions 
Preview.

Here are links to the Mac applications that were mentioned.  The original 
Lexcycle Stanza site got shut down last November, and Mac versions of the 
program can be hard to find.  I give two working links for the Stanza software 
below.
• Adobe Digital Editions 1.8 Preview
http://labs.adobe.com/technologies/digitaleditions1-8/
• Stanza desktop version for the Mac -- CNET download page:
http://download.cnet.com/Stanza/3000-2056_4-198177.html
• Stanza desktop version for the Mac -- Softonic download page:
http://stanza.en.softonic.com/mac 
• iText Express (free) by Lightway at the Mac App store 
http://itunes.apple.com/us/app/itext-express/id416550249?mt=12
• Bookle ($9.99) by Stairways Software at the Mac App store
http://itunes.apple.com/us/app/bookle/id496158508?mt=12

Also, I think you can download a trial version of iText Pro from the Lightway 
web site at:
http://www.jp-lightway.com/appstore/english/iTextPro/

This is the URL of the site that they used before their Mac App Store offering, 
and it also has links to its web page versions in French, Italian, and German.  
iText is really a text editor with some extra features.

HTH.  Cheers,

Esther


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