List User Access by Taxomony

Hey, I have setup TAC lite to control node access by taxonomy terms. I create a taxonomy for each protocol I need to control access to, then on the user admin page under taxonomy based access I grant view rights as needed. This works perfectly.

Now I would like to produce a listing of users with view rights to each protocol (tax term). I don't completely understand how/where the data is being saved. I also use the devel node_access_user block to check rights, but this produces a table based on node.

It looks like the data field in the user table contains some data, but I do not understand the serialized format. Can someone help me get a listing by tax term of users with view rights??

Thanks to all.