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Proxy the iframes through your own server.

Would be very bandwidth intensive? They’re service video streams served over HTTP.

Oh so then I'm pretty sure they use http to reduce CPU load.

Popup/new tab with no encryption of your own site and show the iframe. But then of course it's not inline with the rest of your sites content.

Yeah, I’m considering that.. pop up to HTTP. Then again, the most popular content is being served on HTTP. Bummer!

I can’t see any good solution, unless those third parties start using HTTPS.

I’m considering showing the iframes in an HTTP popup.. that way the main site can be served via HTTPS and the non HTTPS content would simply pop up.

I'm in the same situation as yours. Still looking for solutions.