DRM
Secure ebooks refers to ones that have DRM (digital rights management) which are intended to keep you from transfering or converting the document. It is basically what they did intially with mp3's. In reality most of us just find it really annoying and frustrating.
For the most part you want to look for .imp books, which are listed as multiformat on fictionwise. If you are not buying through fictionwise look for a html, .txt, or .rtf format.
My preferred secure format is .lit, as it converts really well. PDF's don't convert well. .mobi does okay, but it is more work to convert IMO.
Fictionwise normally has pretty reasonable prices, admittdly you need to join their club thingy, but if you buy ebooks really frequently, most of us have found that the price is well worth it.
Amazon has the best prices in general, however you HAVE to have a kindle or use an iphone or itouch. These are not convertable, well they are, but its pita and no reason to do it in general if you have a kindle since it will read the ebook already.
If you enjoy classics check out Project Gutenberg it has a ton of free ebooks that are out of copyright.
Hopefully that answered your questions.
Amy
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