If our landing pages are SSL encrypted, are our forms encrypted as well?

[Dan_Stevens_]

We migrated all of our Marketo landing page SSL encryption last year.  All of our forms were placed on Marketo landing pages and included on our website via iframes.  We are now using embedded forms (not iframes).  Is the data that's submitted via the Marketo forms still encrypted?  Or would that require us to apply SSL encryption on the pages of our external website?