플래시 플러그인 설치 오류

어떻게 든 Fedora Core 3 플래시 플러그인 저장소를 찾았습니다. 플래시 플러그인을 설치하려고 할 때 이 오류가 발생했습니다. 이것이 무엇을 의미하는지, 이 오류를 해결하는 방법을 이해할 수 없습니다.

[root@g22 ~]# yum install flash-plugin
Setting up Install Process
Setting up Repo:  opennms-unstable-fc7
repomd.xml                100% |=========================|  951 B    00:00
Setting up Repo:  opennms-testing-fc7
repomd.xml                100% |=========================|  951 B    00:00
Setting up Repo:  flash
repomd.xml                100% |=========================| 1.9 kB    00:00
Setting up Repo:  opennms-stable-fc7
repomd.xml                100% |=========================|  951 B    00:00
Setting up Repo:  opennms-snapshot-fc7
repomd.xml                100% |=========================|  951 B    00:00
Reading repository metadata in from local files
opennms-un: ################################################## 23/23
opennms-te: ################################################## 25/25
flash     : ################################################## 4/4
opennms-st: ################################################## 22/22
opennms-sn: ################################################## 27/27
Resolving Dependencies
--> Populating transaction set with selected packages. Please wait.
---> Downloading header for flash-plugin to pack into transaction set.
flash-plugin-9.0.48.0-a.i 100% |=========================| 5.9 kB    00:00
---> Package flash-plugin.i386 0:9.0.48.0-a set to be installed
--> Running transaction check

Dependencies Resolved
Transaction Listing:
  Install: flash-plugin.i386 0:9.0.48.0-a
Is this ok [y/N]: y
Downloading Packages:
flash-plugin-9.0.48.0-a.i 100% |=========================| 2.5 MB    06:10
warning: rpmts_HdrFromFdno: V3 DSA signature: NOKEY, key ID 8df56d05
public key not available for //var/cache/yum/flash/packages/flash-plugin-9.0.48.0-a.i386.rpm

작은 도움이라도 대단히 감사하겠습니다. :)