or for the Germans: “Dieses Video ist aufgrund von Urheberrechtsbeschränkungen in deinem Land nicht verfügbar.”.
To get around this you can use a Proxy Server. A Proxy is basically a computer where you detour your internet through. So instead of the website seeing your computer, it will see the detoured computer. This computer resides in another country and might not be restricted to watch the YouTube video!
To find these Proxys you can just Google them. Most of the videos on YouTube are not restricted in America so you try to find an American Proxy Server.
Here is one that