Red Hat Network
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Red Hat Network (abbreviated to RHN) is a system operated by Red Hat that makes updates, patches, and bug fixes of packages included within Red Hat Linux and Red Hat Enterprise Linux available to the public. Users of these operating systems can then invoke the up2date program to download and install these updates. It is akin to other types of automatic system maintenance tools such as Microsoft Update for Microsoft Windows operating systems. The system requires a subscription to allow access to updates. In Fedora Core, it has been supplanted by Red Hat's free yum and apt repositories.