Again, speaking about the wider CDL initiative (one digital copy lent for each physical copy) and not their National Emergency Library, the Internet Archive do implement a DRM on that digital copy, so for the reader to make additional copies of it is not trivial. Regardless, from where do you get a requirement to prevent (with 100% certainty) the reader from making additional copies? When a person borrows a physical book from a library, they could photocopy the entire thing, then return the book they borrowed to the library and still have an additional copy that they made. Does that make library lending illegal? How is that something that can be blamed on the library in the first place?
