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Below, you find the default configuration:
# app/config/config.yml
jms_security_extra:
    # Whether you want to secure all services (true), or only secure specific
    # services (false); see also below
    secure_all_services: false
    # Enabling this setting will add an additional special attribute "ROLE_IDDQD".
    # Anybody with this attribute will effectively bypass all security checks.
    enable_iddqd_attribute: false
    # Enables expression language
    expressions: false
    # Allows you to disable some, or all built-in voters
    voters:
        disable_authenticated: false
        disable_role:          false
        disable_acl:           false
    # Allows you to specify access control rules for specific methods, such
    # as controller actions
    method_access_control: { }
    util:
        secure_random:
            connection: # the doctrine connection name
            table_name: seed_table
            seed_provider: # service id of your own seed provider implementation
<jms-security-extra
    secure-all-services="false"
    enable-iddqd-attribute="false"
    expressions="false">
    <voters disable-authenticated="false"
            disable-role="false"
            disable-acl="false" />
    <util>
        <secure-random
            connection="default"
            table-name="seed-table"
            seed-provider="some-service-id" />
    </util>
</jms-security-extra>