[noste]

At least some books mention that "At the publisher's request, this title is being sold without Digital Rights Management software (DRM) applied." in the book description field. For example: http://www.amazon.com/Pirate-Cinema-ebook/dp/B0089LOEBS/ref=...

[donniezazen]

Is there a way to tell if this book has DRM?

http://www.amazon.com/Neuroscience-Exploring-the-Brain-ebook...

[jbrechtel]

Yes. This part in the details section:

"Simultaneous Device Usage: Up to 4 simultaneous devices, per publisher limits"

means that it has DRM.