BitmapData.draw (..) fails due to Security sandbox

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I am trying to take snapshot of a movieclip which has many children with loaded swf from different sub-domains. Due to security reasons, BitmapData.draw (..) fails, I am wondering, if there is any good workaround for it? I have crossdomain.xml deployed on all sub-domains with right permissions. I can even add Security.allowDomain (..) for SWFs coming from sub-domains but what to do with JPEG/GIF etc?

I would appreciate if someone from Adobe or community can suggest the right-way or a workaround?

I searched about this problem and came to know of following options:-