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== Overview ==
Many software publishers and other organizations maintain servers on the [[Internet]] for this purpose, either free of charge or for a subscription fee. Repositories may be solely for particular programs, such as [[CPAN]] for the [[Perl]] [[programming language]], or for an entire [[operating system]]. Operators of such repositories typically provide a [[package management system]], tools intended to search for, install and otherwise manipulate software packages from the repositories. For example, many [[Linux distribution]]s use [[APT (software)|Advanced Packaging Tool]] (APT), commonly found in [[Debian]] based distributions, or Yellowdog Updater, Modified ([[Yum (software)|yum]]) found in [[Red Hat]] based distributions. There are also multiple independent package management systems, such as pacman, used in [[Arch Linux]] and equo, found in [[Sabayon Linux]].
[[File:Zypper new repository package signing key screenshot.png|thumb|Example of a signed repository key (with [[ZYpp]] on [[openSUSE]])]]
As software repositories are designed to include useful packages, major repositories are designed to be [[malware]] free. If a computer is configured to use a [[digitally signed]] repository from a reputable vendor, and is coupled with an appropriate [[File system permissions|permissions system]], this significantly reduces the threat of malware to these systems. As a side effect, many systems that have these abilities do not need anti-malware software such as [[antivirus software]].<ref>[http://www.itmweb.com/essay503.htm itmWEB: Coping with Computer Viruses<!-- Bot generated title -->] {{webarchive |url=https://web.archive.org/web/20071014212824/http://www.itmweb.com/essay503.htm |date=October 14, 2007}}</ref>
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