Useful objects can be protected by patent. But patents are harder and more expensive to get than copyrights and last a much shorter amount of time. Without doing anything else, as soon as I write something down (like, say, this article), it is protected by copyright for my entire lifetime plus 70 years after I die. In contrast, in order to get a patent on a new useful object, I would need to pay to apply for a patent, prove that my invention is actually new, and wait to get approved. Even if I got approved, the patent only lasts for 20 years. Trademarks lie somewhere in the middle. They can protect non-useful objects but, like patents, trademarks need to be applied for and are not automatic.
Source: http://feeds.slate.com/click.phdo?i=e5993287296eac79ed169bf251ed34bf
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