I'm not at all satisfied with the argument for intellectual property, in some way wildly against it. I'll explain my reasoning:
Intellectual property is the ownership of information, whether in art or in the field of technology. A book, for example is just a collection of information, real or made up. This can be extended to any creative or non creative field.
Some information is never copyrighted because it counts as a discovery. Discoveries are considered to non creative and belong to nature, for example, electricity counts as a discovery because it is making use of a natural phenomena; it is considered unfair for one person to claim ownership of it for that reason. If electricity was copyrighted then no one could even discover it independently making a ridiculous situation when one person can stop the development of science by not allowing anyone to use or copy his research. I don't believe there is any argument here.
All other types of information come under inventions. It is considered that a device such as the telephone is an invention because it is not a natural occurrence and took creativity to come up with. A piece of music, for example, is also an invention because it was composed, or invented, through the construction of ideas. These are generally considered to be applicable for copyright because they are products of work from individuals rather than something that occurs in nature.
However, this does have problems. Consider the line "It was a bright cold day in April, and the clocks were striking thirteen." What is this? If you recognise it you would say it is the opening of 1984 so belongs to George Orwell, however, it is still purely a group of words forming a sentence, and unless you call the concept of a sentence a possession of someone, this cannot be copyrighted. Someone who never read or heard 1984 could easily come up with the same sentence or something very similar because it is purely a sentence in the end.
To put it another way, the problem lies in that a creative invention can turn into a form of discovery if you look at it in a certain way. Even though it takes effort and creativity to come with these inventions they are in fact discoveries when broken down. Orwell, if you like, discovered the effectiveness of the sentence quoted above, rather than invented it.
It is therefore unfair and wrong to copyright anything. It is immoral to claim possession over an idea.
btw I'm in fact quite a keen composer, I'm not just arguing this as an excuse to get something for nothing. I apologise if this argument has been used, I'm not a brilliant searcher. I also think this is a very, very complex topic, so I'm not quite 100% of my reasoning, but I've found all sorts of faults in over people's reasoning like stef's in the podcast trio on the subject.