Debian Live etch backports

[jasonshah at gmail.com (Jason Shah)]

When I try using this line in /etc/apt/sources.list:
  deb http://ftp.debian-unofficial.org/debian-backports/ etch-backports main
contrib non-free
and do:
  sudo apt-get update
I receive the following error:

Reading package lists... Done
W: GPG error: http://ftp.debian-unofficial.org etch-backports Release: The
following signatures couldn't be verified because the public key is not
available: NO_PUBKEY 736BFF07FDB8D39A
W: You may want to run apt-get update to correct these problems

Any solutions for this?  Seems like a repository issue.

Thanks,
Jason
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