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 = bb42b1372940c8f3130de306cb4a2d607ce48a1d

For explanation of what a SHA1 digest is, please visit this website:   About SHA1 digest