The Book module
Lightroom 4 now features a Book module, which includes a direct connection to Blurb, a photo book vendor that has proven popular with a lot of photographers. I don’t know whether there will be plans in the future to extend this functionality to produce books through other book service vendors, although it is possible to produce a PDF output. This may offer a means to produce layouts that can be printed elsewhere, but only if the page formats are exactly the same. So, yes, the Book module is steering you toward using a specific vendor, but no more proprietary I suppose than the way iPhoto and Aperture are linked to Apple’s own book printing service.
Note
Whenever you work in the Book, Slideshow, Print, or Web modules, you are ...
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