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The problem is that most programs, apps, and Readers do not do ePub 3. iBooks does ePub 3. You should test these ePub with ADE 2.0.1to see how well or not they work and if they don't work well enough, then when they are sold, you'll need to specify that they require an ePub 3 compatible program.
There are so many ePub 3 (that should be ePub 2) that when an ePub that needs an ePub 3 reader comes along, people don't know and if they buy, they can end up with a book they cannot use or cannot use well enough.
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