About Security Keywords
Security keywords provide a way of limiting the documents within a document type that a user can retrieve.
For example, you have a Homes for Sale document type and you specify Home Location = Lowell as a security keyword (Home Location being an index field, and Lowell being an index value) for a particular user. As a result, the user can only retrieve documents of the Homes for Sale document type, in which Lowell occurs in the Home Location index field. Documents with Home Location other than Lowell (for example, Leominster or Fitchburg) are not available to the user.