How are online survey responses submitted securely when the link to the online survey only has HTTP:// in the prefix?

Onlinecsurvey responses are submitted securely even though the link (URL) prefix to a SurveyGold online survey form is HTTP://.

When the respondent selects the 
Submit Your Responses button in the online survey form, a secure connection is made to SurveyGold online services via SSL (using an HTTPS:// link prefix) to submit and process the responses securely.

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