[greggman3]

isn't that an input problem not an output problem? Is it giving you the quotes directly from the ebook or is it converting them on copy-paste? I'd assume there was a bug on the input side, that some tool wrongly converted `printf("Hello World")` to `printf(“Hello World”)` so what's in the ebook is wrong already. If so the issue is further up the chain.

[roryokane]

In this context, the selection within the ebook contains no quotes, whether ASCII or Unicode. The problem is that Apple’s Books app adds quotes and attribution text around the selected text. Books knows that the text it is putting in the clipboard isn’t what you selected, and it doesn’t care.