It's not a question of protection. It's that the Google PDFs are images -- sometimes you can even see the hands of the guy "digitizing" the book.
So you can't export as text because your computer can't read. One thing you can do is to print the pdf to a Microsoft Office Document Image Writer (instead of to an actual printer). This creates an .mdi file, which separates the pages nicely into individual images. Then you can import them page-by-page into an image handler, for instance Paint Shop Pro. Even better, you can write a script to page down, grab the page as an image, paste it into your image handler, save it off, clear memory, page down and start again...
Then you can import the whole folder of images into the Connect Reader. Their image size scroll bar makes it pretty easy to get a readable image, but if you want to read it on the Reader itself, you have to generally experiment a bit with size and add some resizing steps into the script that saves off the images as jpegs or tiffs.
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