We provide SSL URLs for preview images, and support multiple sizes of preview images, but this is only fully functional for automatically generated preview images. For automatically generated preview images, we generate preview images for each resolution that the video is transcoded at, and each of these has its own SSL URL. There's a community article with some further info here: http://community.ooyala.com/t5/Developers-Forum/V2-Thumbnail-Query-Example/td-p/1714 If the user uploads their own preview image, we do not generate that at multiple sizes. We also do not provide an SSL URL for user uploaded preview images in API responses. However, one is created. Given a preview image with an HTTP URL of http://ak.c.ooyala.com/thOHg1cjqAFUknqN12PepXVUA0BZGsPA/promo242577482, the HTTPS URL will be https://ec.c.ooyala.com/thOHg1cjqAFUknqN12PepXVUA0BZGsPA/promo242577482.