Well, I guess it would be nice if we could have some precedent for the claim that downloading copyright protected information is not in itself a breach of copyright. It makes sense from the point of view that distribution is the act protected by copyright, not the mere act of copying . If that sounds odd to you then that's probably on purpose, There's been plenty of opportunity to rename copyright to authorrights or…
"distribution is the act protected by copyright" was the rule all along in many (non-US) jurisdictions, not an American so not sure about how the US does things. This is why you often see people getting fines for torrenting (Germany is extremely notorious for this for example), but fines for using Usenet, IPTV, streaming or book download services are a lot more rare (which doesn't mean they're nonexistent)! Operating…
You generally can't set a client to 0B/s (as zero usually means “no limit”) but I'm not sure a good¹ lawyer on the other side would let you get away with claiming glacial distribution is not still distribution. At 1Kbyte/sec (I don't know a client off the top of my head that has control down to the single byte) a 50MByte file (not unusual for a book with illustrations/photos) can be transferred in less than 15 hours, a couple of Mbyte (a plain text book, compressed or just short) in less than one hour.
There are clients that can be set to not seed at all, or you could patch a common client that way. Some that don't even offer the capability at all (some command-line wget-style tools), that would be a legally safest option IMO².
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[1] good as in good at their job, no moral judgement implied!
[2] caveat: not a lawyer, never played one on TV, nor even in local am-dram.