Things are getting confused in this thread. Google strips meta data when they put images on their image search site. They do not have the ability to strip it from other web sites. SO if you put images on your web site with metadata, that metadata will remain in place. When Google spiders you web site and finds images, they take copies, strip the metadata, then post those files on their image search site. So if someone finds your mages on Google's site, and uses that copy for other purposes, they are using a copy with no metadata.
Bookmarks