Serving private content from CloudFront with Signed Cookies

Cloudfront supports signed cookies for serving up private content but I cant find any examples on how to do this.

I have found examples on how to sign URLs with the Java AWS API but not Cookies, can someone please share their experiences with doing this and is this the best way to secure multiple forms of media being served from CloudFront.

Our site has images and video that are uploaded by the user, which can then be viewed by searches on our site, I want to make sure that these images can only be served by our site and not copied for later use.