Photo metadata will usually remain as part of the placed image, I don’t think Sitely strips this data from the image file. If you want to display that metadata in some way, you can use Sitely’s smart field to extract the data and display it in your web page.
Copyright protection doesn’t always work, even if it’s enabled. I think you know that very well.
As for the description of the photo contained in the file, it is not visible when inserted. So I move the title of the file, it could also move the description and tags.