All good approaches, though I'm not sure that they are good for me (this is usually the case it seems as I always wind up coming up with off-the-wall issues that need to be addressed LOL). I am noticing it mostly on Office documents (e.g. Word, Excel),
but not on PDFs. I'm even seeing these prompts and I am a site collection administrator.
Could they be any negative side-effects for turning off "Security Validation" in Web Application General Settings? I think that if I turn that off then the users will not be prompted at all, though I'm concerned that there may be other ramifications
. . . I just want to make sure that people only see what they are supposed to since I have libraries set up with restricted access (read-only, contribute, etc.).