Flex - Passing Form Data through HTTPS

I kept getting errors trying to pass a Flex form through HTTPS.
The whole key to the problem was a crossdomain.xml file.
You must put secure="false" on your domain or it won't work.

  SYSTEM "http://www.macromedia.com/xml/dtds/cross-domain-policy.dtd">

  

The wording secure="false" bothers me though. Doesn't that defeat the whole purpose of running it through HTTPS in the first place? Or does secure="false" mean something else?
Can someone enlighten me?