Licenses are provided based on the number of entries you plan to manage using Directory Server Enterprise Edition. After a license is provided, you can replicate the entries as many times as required to get maximum flexibility out of your directory implementation. The only condition is that you do not change any of the replicated entries and store all of the replicated entries on the same operating system. If the replicated entries are stored on any other operating system, you must purchase a license for those entries.
Solaris provides 200,000 free entries for Directory Server. In this case, you only have license for the core directory server component, not for the other Directory Server Enterprise Edition components. You can purchase an upgrade from core directory server component to full Directory Server Enterprise Edition.
You can review the latest license for a given version of a product before downloading it from http://www.sun.com/software/products/directory_srvr_ee/get.jsp.