In summary, I am looking for a content-based access control solution, NOT a user role-based solution.
The scenario: Page 1 contains content from various access control levels (i.e. levels a, b, and c).
Currently in Drupal, you can display/hide content based on user role. However, I want to block access to the entire page if the user is not in the highest content level required.
Example: A user with access level a and/or b would be blocked from seeing page 1, but a user with at least level c would be able to see the page and all of the content on it.
The catch being that the per-page access levels must be dynamic to prevent incorrect page tagging as content is added, updated, or removed.
Does a module like this exist already, and if so, what is it?
If this doesn't exist, is there a straightforward way of implementing this?
Server configuration is Drupal 7 with some Open Atrium 2 modules.