Copying Various Forms of Media

If, as is the case in some countries, “file sharing” (such as sites like limewire and Kaza, or torrent sites like mininova and bittorent) is legal, provided that it is not done for profit. If that is the case, can somebody explain to me why their would be an issur in copying (if there is any at all), and what, when i copy a cd, movie, etc. from a disc or someone elses ipod, would i be stealing (even the “perpetual lease” to me doesn’t seem like it would make a difference, b/c forsure i am allowed to copy my cd onto my ipod, and when i am taking it from the ipod, i am not taking anything from the cd). thanks anyone for the clarification