Protect or lock photos in Aperture?
Is there a way to protect or lock photos in Aperture? I use Aperture to edit my photos, but am using iPhoto for a photo book layout. I'm marking the photos I'm using in the book with a color label, and also marking them a 5-star rating, but I'd like a way to lock them so I don't accidentally delete any that I'm using in the photo book.
Is there a simple way to do this? Thanks.