I'm thinking I want to avoid "general" or "universal"--because those both label the viewer. They do so very abstractly, by saying "suitable for everyone," but they're still labeling the receiver, not the content itself.
I tried to find words that meant "this content is mostly inoffensive, and would be acceptable in most public venues" or "this content contains no offensive matter by 95+% of people's judgments"--and couldn't find them. Was very odd. Nice little Newspeak exercise, searching for words that aren't defining everyday stuff by what it's not.