When to use the nogpgcheck when installing using yum

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http://forums.fedoraforum.org – Hello, Fedora 18 I am just wondering when and why I would have to use the --nogpgcheck when installing rpm packages? yum --nogpgcheck localinstall packagename.arch.rpm I understand that the localinstall will install a rpm package that has been download on to my system and it will install all the dependances. However, I am not sure when I would have to use the nogpgcheck option? Many thanks for any suggestions, (HowTos)