There is something like 'field validation', which determines what is allowed to be typed in a field and what is not. However, the title field is a special case. It is not regarded as an ordinary field. This module makes it possible to set a validation for the title field as well.
A default search page looks for content in all content types. If you want to hide some content using roles and permissions, the search pages continue to index this hidden content. When a user clicks these search results, they will get a page with no access. We want to avoid this.
Content can be maintained by a team. Permissions can be set by role. You can give access to somebody to produce a draft version of new content, without producing it. It needs a review of a publisher. The Workbench module (not this one) gives a view display of all the changes that have been made.