unsigned virus definitions

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Listed in the "all MD5 hashes" link of Symantec intelligent updater page
are a few files in a catagory: unsigned/yyyymmdd-vvv-i32u.exe and
unsigned/yyyymmdd-vvv-x86u.exe. A google search turns up the same MD5
text files and a ftp site with some unsigned intelligent updaters, but
no explanation of what these unsigned updaters are used for. Does anyone
know their purpose?

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