Most scientists and inventors want to protect their work with patents, filing hundreds of thousands every year. But without patents could the world have cheaper healthcare and more efficient cars?
Trademarks have to be protected, but should anyone be allowed to trademark a colour or a phrase? And is it really a sin to buy a fake Rolex watch?
The music industry has been revolutionised by the internet explosion. With free music available online, why should anyone pay for it?
Anyone with a broadband computer can now download and watch virtually any movie free of charge. This is illegal, but the chances of being prosecuted are close to zero. Some consider this the death of an industry, but others call it healthy anarchy.
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Plagiarism has become a nightmare for teachers, publishers and journalists. Anyone from a lowly GCSE student to a high-profile writer can easily copy a chunk of text from a website, and it is equally easy to catch someone doing so. But there are those who defend the free exchange of other people's words as a basic liberty.