How do I protect my webplayer from beeing used from other sites?

How can I protect my own webplayer so that other sites cannot use it? Kind of "copy protection"?

Although this is not a 100% solution, but as a headstart, read here about checking the URL values:

http://unity3d.com/support/documentation/ScriptReference/Application-absoluteURL.html

as well as this:

http://unity3d.com/support/documentation/ScriptReference/Application-srcValue.html

and further watch Tom Higgins Unite '07 speech about that topic:

http://unity3d.com/support/resources/unite-presentations/developing-content-for-the-web

Maybe this could help ;)

http://blog.gfx47.com/2011/03/22/secure-your-unity3d-web-applications/