You own the copyright, but they have control on its usage other than being put in a personal album, or something similar, unless you agree terms.
I have a letter from my company authorising me to take pics on premises and during work.
The deal i have struck is that any pictures i wish to publish either here on this web site or via submission to a magazine where possible earnings are not great then i can once they have approved it and in return they get to use the picture for internal usage subject to me being accredited as the photographer.
If i wish to use the pictures for any purposes with real earnings potential then i have to get the picture(s) approved and cough up for a permit. And by the same token any pictures they see that they want to use for external purposes (advertising etc) then they have to pay me a fee accordingly.
But back to Bills question...
Would the pictures be covered as part of the company - that is would the company be owning & selling them or would the company merely be acting as an agent for you "Big Bill" the photographer? If the company is designed to act as your agent (even though it may be run by you) then the pictures should be copyrighted to yourself. If however the photographer and the company are operating as a single unit then the pictures get copyrighted to the company.
I think that's how it goes. I did look into it once when helping my daughteer with her law degree. It's an interesting subject.
Hope that makes sense - it did to me as i was writing it...
Andrew
Never going to be the best photographer in the world...
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