Yes your photos are safe. Please see our FAQ post " How do I share photos in Revel" http://forums.adobe.com/thread/1157995?tstart=0
When sharing your albums out with others, you will want to set "Allow Downloads" to OFF. This will prevent others from being able to download your images. When viewing with the downloads off, then right clicking save image is not available. I test this on mac and pc for you.
Let me know if you have any other questions
Good to hear that. Let me know if you have any other questions about Revel.