Mac OS X Server 10.5.6
The 10.5.6 update is recommended for all servers running Leopard Server.
For detailed information about this update, please visit this website:http://support.apple.com/kb/HT3192
SHA 1 digest = 4aff32ff34ff9a550a24898108bab56a48512f8f
For explanation of what a SHA1 digest is, please visit this website: Mac OS X: How to verify a SHA-1 digest.
For detailed information on Security Updates, please visit this website: Apple security updates.