Two table approach to user security permissions

As promised i have made a quick video on how to use a multi table approach to user security permissions and the benefits allowing a user to reside in multiple permission groups
Sorry, video is a bit rough, when i get a chance i will produce a more polished version.
Hope i have explained myself clearly
Any questions/comment, please ask and if anyone can assist in the problem i highlight at then end i would be most appreciative!! (total length 7m40s)

using-two-tables-for-permissions.mp4 (18.1 MB)