I vaguely remember using vital source books and I believe it is a proprietary software that opens the books. If printing is allowed you can try printing to pdf, although sometimes that function is not allowed. I did have luck once printing to a networked computer's PDF printer, bit a lot of those books also have page # restrictions, i.e. you can only print 10 pages at a time. Dang book publishers make it so hard to use what we paid for.