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From what I gathered Amazon is the only one that includes an identifier. Look for a string starting with “atv:kin”.
The DeDRM fork removes it: https://github.com/noDRM/DeDRM_tools/blob/bf2471e65b1f52bb5292caeba70a9aea31bf6653/DeDRM_plugin/mobidedrm.py#L254
Well, first of all you really should not be using Windows 7 anymore. For the TPB, I don’t think they check the torrents, anyone can upload so it’s not a trusted source. It’s in the unsafe sites list on the megathread. And how would you know that you never had a malware on the TPB?