How much creator credit is enough?

Article by a machinma artist about a response to one of her videos may be of interest to vidders - live action, machinma or anime:

Proper attribution of images taken in virtual worlds.

In Real Life, when a photograph of a place is published... say, the Empire State building in New York, one is not expected - nor is there a legal requirement - to credit the building's architects, owners, the construction companies involved or the city of New York. So why is it different in virtual worlds?

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