On a moral level, I would say any of the above (including the corollary) is justified.
Although arguably downloading a torrented ebook of a pbook you own is furthering piracy on a moral level -- approving of people sharing them since it is morally "OK" for people who own the pbook.
Also, if you seed it to others you are aiding and abetting piracy.
Granted that you are practically speaking untouchable.
If we are talking about legally, it is of course illegal to photocopy your books.
