Access Manager is one of the best-designed WordPress plugins for controlling access to knowledge base content.
Features of Access Manager include:
Unauthorized users will be blocked from accessing the following content:
- KB Articles
- KB Categories
- KB Main Page
- KB Categories Archive Page
- KB Search results
- WordPress Search results
- KB add-ons content
- Multiple KBs
- Administrative screens for:
- KB Configuration
- KB Access Configuration
- KB All Articles
- KB Categories
- KB Plugin Info
You can read detailed documentation about Access Manager here: documentation.