Domain Services for Windows (DSfW) emulates the Active Directory security model on top of eDirectory, so most of the security considerations for both Active Directory and eDirectory apply to DSfW. However, there are some key differences:
Section 2.1, DSfW Unit of Administration
Section 2.2, Partitions and Domains
Section 2.3, Understanding DSfW in Relation to Active Directory
Section 2.4, DSfW Authentication
Section 2.5, Authenticating to Other Services
Section 2.6, SYSVOL Replication