Currently YouTube doesn't offer an option of embedding its videos via https, so if you add a video to a secure page, browsers will display a security warning.
YTPlayer offers a simple way to get around this. The SWF file acts as a proxy between your site and YouTube, and pulls in the video you specify in your HTML code. The result? No security warning!
See the Implementation page for instructions on how to use YTPlayer on your site.
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