Good idea of plugin, but 100% security is not implemented: when you protect content like:

{...}
protected words for admin
{...}

and then if you try to find the word "admin" in search tool - you see all the phrase:

protected words for admin

I think It's better to include content restriction in publishing tabs when editing an article. Is there anybody knows plugin like this?
Top level of security - if all the navigation and search interfaces does nothing to show protected content!

thanks for developer for great work, but i want more!!! :)