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Moscool - Each of those are components that there have been flaws found and fixed. Most of them are Open Source and so Apple has updated the version to address the bugs and any resulting security flaws.

gm4 - Is GNU's version of m4, which is "an implementation of the traditional Unix macro processor". (Open Source Software that has had the problem fixed, and Apple is passing on the fix.)

groff - GNU's version of troff. "A typesetting package which reads plain text mixed with formatting commands and produces formatted output" (Again, Open Source, has fixes, and Apple passes it on.)

Mail - Apple updated Mail, particularily the CRAM/MD-5 authentication to make it more secure. I'm not sure if there was a flaw or not, but there was a fix, it could be keeping current with the Open Source Community, or a flaw that was found or just both.

OpenSSL - Open Source Software to provide a robust way of implementing the Secure Socket Layer protocol. Most likely a security fix.

Personal File Sharing, and QuickTime for Java are fixes that Apple has been made aware of and has issued a fix to protect from unauthorized access.

zlib - More Open Source Software, and as said on zlib's site: " A Massively Spiffy Yet Delicately Unobtrusive Compression Library", my guess is that Apple uses zlib to do compression, possibly even the archive function in Panther. I'm not sure, but I do know it has to do with compression, and it being better then the standard compress command found in UNIX.
 
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