They're annoying aren't they? You always seem to lose videos to them. Well, not anymore. This disclaimer explains how their infringement is false. Copyright Disclaimer
Under Section 107 of the Copyright Act 1976, allowance is made for "fair use" for purposes such as criticism, comment, news reporting, teaching, scholarship, and research.
Fair use is a use permitted by copyright statute that might otherwise be infringing.
Non-profit, educational or personal use tips the balance in favour of fair use.
Include this in your disputes and you will win. (I've done this on a few of my videos that got blocked, and won.)