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I believe every tube site would be different. On mine, I do require a sponsor name, url, and 2257 information.
A lot of submitters watermark over the sponsor's; pointing to their own domain. As long as it forwards directly to the sponsor I don't have a problem with it; the sponsor might.
As long as what you wish to submit is legal and you have the documents to support it, I believe most tube sites will accept your submissions.
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