Here is a scenario:
I am embedding form.swf in http://somesite.com/page.html. The SWF is loaded from https://example.com/form.swf and submits to https://example.com/secureform.php.
So, is the transmission to the server secure?
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It depends what you mean by secure. I think you are asking whether the submitted data is secure, and the answer is that if you are using HTTPS, it is.
HTTPS on the SWF ensures just that the Flash object cannot be maliciously modified between the server and the client.