Taxonomy based Access Control List module provides taxonomy-based access to the nodes. tacl module provides only a common API but this package also contains a "frontend" - tacl_user that allows for managing per-user, taxonomy based permissions.
The target audience are site builders (tacl_user) and developers (tacl).
Features
Control access to view, update and delete a node based on taxonomy term
Handles per-role settings (only in tacl API module)
Handles per-user settings
Handles multiple terms and vocabularies for the same node
Taxonomy Access Control and TACL should be merged at some point into API and dependent module. TACL provides an API, while TAC is full module on its own. TACL provides more features than TAC, that is:
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