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I shot a yearly art photo book for a company for 4 years with no contract. I wasn't paid the last year, and the company dissolved shortly after. Some of the photos were photoshopped by an independent contractor so I'm not sure if this counts as a "collaborative work". Now one of the partners is trying to restart the company, and re-use my images for new commercial products and doesn't intend to make good on my last payment, nor does he plan on paying me royalties for any of the past images.