Funnily enough, next to never. Take a look at just about any mainstream site and there'll be a disclaimer on the page, usually at the foot of the page in obscurely small and light coloured text, warning that everything on the page, or within the site is protected by copyright... Copyright isn't what it used to be as noone is really gonna make a shit load of cash using DR Evil as their business logo, but if they did they would then worth chasing... it's free money after all...
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