Who owns AI-generated content, and do I have to disclose that I used AI?

Under the US Copyright Office's 2025 report, purely AI-generated output is not copyrightable and prompts alone do not make it yours; you own the parts where you added real human expression, selection, or editing. Disclosure is nuanced: the FTC requires it for AI-generated testimonials and platforms like Meta require it for realistic AI imagery, but for ordinary AI-assisted marketing copy, no blanket label is required. Research shows heavy-handed labels can reduce trust, so disclose where rules or realism demand it and focus on being genuinely accurate everywhere.