If you are not removing the DRM imposed on your purchases, to restrict your use of
the books you buy, then the JBL can accommodate three strains of the infections,
the Adobe Digital Editions (ADE) DRM for .epub&.pdf files, The Secure eReader DRM for
.pdb files, and the Barnes&Noble (B&N) DRM for .epub files. Of those three, the B&N
offers the simplest and least intrusive process for the purchase of current high profile
releases from the major publishers. The ADE scam is more widely adopted and is also
used by most USA library systems to loan books. There are a few online retailers that
offer at least some ebooks for sale without DRM, (Baen Books is a well liked example)
and others like Powells that offer a number of different options.
A great resource to keep in mind:
http://inkmesh.com/
If you learn how to remove the DRM you can of course buy from anyone and in almost
any format, if you learn to use Calibre to convert to any of the many formats that the
JBL supports, (I like .epub myself.).
Luck;
Ken