Your best resource will be the Copyright section of our Help Center, start with these top FAQs: https://goo.gl/FzBC2x . You can also review info on fair use, creative commons, and our troubleshooter linked from there. Hope these resources help answer your questions.
If you believe it happened in error, you can dispute a Content ID claim by following these steps: https://goo.gl/fHCa7u . Hope this helps.
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