my name is Brady and I'm the Product Manager for ebooks at Blurb. Thank you for your feedback about viewing fixed-layout ebooks on platforms besides iOS. While we do create reflowable ebooks that you can sell and view on other platforms (including Amazon, Google, B&N) we're in the process of addressing your request for fixed-layout ebook portability as well. Stay tuned!
With respect to DRM and copy protection Blurb does not provide that service. All ebooks downloadable from Blurb are DRM free. However, when you take your ebook to sell on the Apple iBooks Store you can opt to enable DRM copy protection with that marketplace.