I just went there and found this message:
Quote:
Problems with Blocking Access
March 2 2018: There are some problems with the automated software used to prevent abuse of the Web site (mainly to prevent mass downloads from hurting site performance for everyone else). Unfortunately the systems staff will not be available until Monday, to apply fixes. Meanwhile, it appears that downloads of epub and mobi (Kindle) formatted eBooks is triggering blocks. The HTML ("Read this book online") links seem to work better. Apologies for this problem. We hope it will be fixed early in the week of March 5.
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So maybe part of it is a glitch in the software from an encoding error.