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The document is protected with a chunk of embedded JavaScript. Neither Poppler, nor as it turns out Mac OS X's Preview can execute the JavaScript. In the case of Poppler it would also need to have the ability to fill in the form, which is also not supported.
So two major chunks of code would need to be implemented in Poppler for this to work on the iLiad: fillable forms and JavaScript.
Neither of those has a high probability of being implemented any time soon.
Use of any tool to circumvent this form of protection in the USA/EU is of course a violation of the DMCA unless you have permission from the copyright holder to do so. But if they were willing for you to have unprotected files they'd just give them to you right? So legally you're very likely stuck to viewing them on a PC.
I'd hate to see Mobileread or any of the tool authors (any tool that doesn't respect the copy protection is in violation of the DMCA as a "Circumvention Device") get in any trouble by continued discussions of how to break into the files.
On the hopeful side of things, I've got a Java based PDF viewer cooking for the iLiad that should be able to legally grant access to these documents. So stay tuned here to Mobileread.
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