# Example - Custom Security

A repository might use a security model that resembles NT security. For example, the ACL might specify a list of groups that automatically grant access to the document if the user is a member. This would require a different ACL, and an additional check to be performed.

The following example shows how to modify the value of the `SecurityACLFormat` parameter. When compared to the standard NT ACL described in Example - NT Security, you can see that the underlined section has been added:

    SecurityACLFormat=<E=B!>:U:<U=SLE+=>:G:<G=SLE+>:OG:<OG=SLE+>:NU:<NU=SLE->:NG:<NG=SLE->

If the ACL is modified for custom security, and has an additional ACL field with positive groups that have priority over the negative terms, the `SecurityACLCheck` could be modified as follows:

    SecurityACLCheck=OG=[DG]?P:-,NU=[DU]?F:-,NG=[DG]?F:-,E=1?P:-,U=[DU]?P:-,G=[DG]?P:F

The new value in the `SecurityACLCheck` parameter is explained in the following table:

`OG=[DG]?P:-` | Compare ACL field `OG` to each of the users group memberships. If the user is a member of one of the groups, allow access, otherwise continue. The remaining checks are the same as for the NT security type described in Example - NT Security.

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