Security Update 2011-001 (Leopard - Client)
Security Update 2011-001 is recommended for all users and improves the security of Mac OS X. Previous security updates have been incorporated into this security update.
For information on the security content of this update, please visit this website: http://support.apple.com/kb/HT1222.
SHA 1 digest = bbbd6cad211eafc900e2562f900b875287e533ff
For explanation of what a SHA1 digest is, please visit this website: About SHA1 digest
Read more http://support.apple.com/kb/DL1366