Well as I understand it you have to make sure it is 'fair use' rather than outright copying of large chunks. If you use more than (I think) 10% of a given text you have to have permission from the author whose work you are quoting. I'm not sure what the procedure is for a book that's in PD. I mean is it a translation of a PD book? If so how long ago was it translated? Even if the original was in PD the translation might not be.
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