just tried to do a sudo zypper dup on my system and got this error about this
repo.  i have no yet updated my system:

jshand@johns-pc:~> sudo zypper dup
[sudo] password for root: 
Retrieving repository 'VLC Media Player' metadata
--------------------------------------------------------------------------------[/]
Signature verification failed for file 'repomd.xml' from repository 'VLC Media
Player'.

    Note: Signing data enables the recipient to verify that no modifications
occurred after the data
    were signed. Accepting data with no, wrong or unknown signature can lead to
a corrupted system
    and in extreme cases even to a system compromise.

    Note: File 'repomd.xml' is the repositories master index file. It ensures
the integrity of the
    whole repo.

    Warning: This file was modified after it has been signed. This may have
been a malicious change,
    so it might not be trustworthy anymore! You should not continue unless you
know it's safe.

Signature verification failed for file 'repomd.xml' from repository 'VLC Media
Player'. Continue? [yes/no] (no):