OK guys, I had this problem with a few of my vids and this thing worked! It took me a bit of searching to find this information so I have posted it below so you can use it to your advantage if you ever hit this problem. I have used this method and I can confirm it to work. The videos below are example of this:
This is just for the audio, if it is a video problem then I can't help you...
Now onto how to actually get the audio back.
1) Go to "My Videos".
2) Select "Resolve Copyright" on the video you are having copyright issues with. OR, go to the video itself and choose "resolve copyright" from there.
3) Scroll down and pick the option "I want to learn more about this dispute process".
4) Scroll down and pick the option "Take me to the dispute form".
5) Pick option #2 and PASTE the following statement into the text bar next to it;
"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 favor of fair use."
6) Fill out the rest of the info on the page. Use your REAL name where it asks for it. Choose "Continue" when all information has been filled out.
7) Scroll down on the next page and select "Submit dispute".
Within 20 mins you should be able to hear the audio!
This should work on most vids with copyrighted audio, if it does not then I am sorry. If you intend on becoming a YT partner, take out the sorted vids first. If not then fine. :)
These vids below are both mine, and they show this works. If you wish, post your vids here to prove this works for you and this info is reliable:
https://www.youtube.com/watch?v=scz-k7bZx6Yhttps://www.youtube.com/watch?v=djiJBb8SBHk