The simple answer is no, an idea in itself cannot be protected. The Chambers 21st Century Dictionary defines an idea "a thought, image, notion or concept formed by the mind" so by its very definition an idea is a totally intangible thing. In order for there to be any protection of an idea, it must first make the idea exist in some tangible way. In the case of copyright law, it is the work that realises the idea that is protected (i.e. a document), and it is the act of recording that work that fixes copyright in the item itself.
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