why is davfs2 package unsigned?

[Jay Summet]

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apt-get complains about an unauthenticated package when I try to install
davfs2. Any reason why, or how to fix?


Specifically, version 1.1.2-3 (feisty) from Utilities (universe),
priority extra.

Thanks,
Jay



summetj at constantine:~$ sudo apt-get install davfs2
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following NEW packages will be installed:
  davfs2
0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
Need to get 69.4kB of archives.
After unpacking 266kB of additional disk space will be used.
WARNING: The following packages cannot be authenticated!
  davfs2
Install these packages without verification [y/N]? N
E: Some packages could not be authenticated
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