Everybody commits a crime unintentionally quite often, presumably more than he or she thinks. Some people smoke in smoke free zone, and some throws away litter in the middle of street; it happens more frequently when it comes to cyber world. When someone wants to watch a movie but has no friend to go for it with, they just download it somewhere on the Internet and enjoy it; when some people want to save some music on their MP3 player, they download them illegally instead of paying for them. Those behaviors are certainly crimes according to constitution, maybe in most countries. Then, those crimes which are the same as theft in terms of behaviors themselves, are 'actually' the same as theft? I do not think so. It is not the truth, at least, yet.
It is definitely stealing copyright owners' rights to illegally download music or movies. They are supposed to get some money in return to sell their copyright. People who downloads other's work without paying for it are surely taking their right to make money. I, however, do not think it is exactly the same as theft because properties like movies or music do not disappear even though they are taken from others. It means when you download movies on the internet, you are not taking their whole properties, but kind of sharing it. It sounds ridiculous, but when you do not spread the movies or music out to make money, it is not as serious crime as theft.
Sometimes illegal downloading even helps copyright owners make money. It is a matter of course the more people download illegally movies or music, the more famous the movies or music become, which means the behavior of illegal downloading could promote movies or music. In the current music field, composers or producers who may have copyright for the music, do not expect to make money from selling their music, but from holding concerts, or selling the image of singers who sing the song they made. It means it is not a big deal to spread their music almost free, but it is the matter to make it famous. In this point, these crimes could even help copyright owner make money.
There, however, are some cases illegal downloading is taken the same as theft or more serious crime than that. For example, Disney never allow their animations are spread for nothing; Disney accused someone of downloading their newest animation 'Frozen' illegally. They take their intellectual property itself important, so they do not want anybody use their effort without just cost. For me, however, their mind is just bluff of someone who has enough.
Illegal downloading cannot be the same as 'physical theft.' It does not go away even when it is spread out, most of time the copyright owner does not even know their work is stolen. Of course, copyright should be protected by law, but it is early to apply a strict rule to illegal downloading yet. People do not take it as a serious crime, and they do not even feel guilty for doing it. It is firstly necessary to change public awareness for illegal downloading, and it is the next step to regard illegal downloading as the same as 'actual' theft.