For one's own personal use, one can leave errors.
My experience has been that you should not rely on it too much if it is a non fiction work, because I have seen a number of very plausible errors that change the meaning considerably.
I make it a practice to download the PDF source along with the OCRed document. It is a devourer of hard drive space. Thank goodness for my 600 GB hard drive.
Unfortunately, the Distributed Proofreaders software is in PHP which I am not running. My kingdom for a Windows binary!
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