Quote:
Originally Posted by theducks
How did you know if your paper edition was un-modified?
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If I give a bibliographic citation for a print book, anybody with the same material as described in the bibliographic citation can assure themselves that the printed text did give the statement that was cited.
With ebooks, even when given the same bibliographic data, there is no assurance that the copy you have, contains the same text as the copy I have.
As to why reputable publishers do it, it is sold to them as a form of DRM, complete with patents issued by the German Patent Office.
Some theological publishers do it, in an attempt to minimize the possibility that nobody will realize that they are not teaching the same thing that they taught two decades ago.