Google's
help page just says
Quote:
Images in our PDFs are highly compressed
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but Adobe's Digital Edtions FAQ is a bit more forthcoming:
Quote:
Why don't some Google Book PDF files work with Digital Editions?
Google is using JPEG2000 image compression to compress certain kinds of color-based page images, and this format is not supported by Digital Editions 1.0.
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Google says that xpdf (with JBIG2 patch) reads its PDFs, so there is a chance that an updated ipdf could too.