[Icecast] Cannot update xiph repository

[Damian]

Hi,

I apologise for the naiveness of this question, but I experienced an error when running apt-get update on Debian 9.
It’s telling me that it can’t update the xiph repository.

Not sure if I should be asking for help about this here, but if not… please let me know where I should take this issue.
Any help is appreciated.

Damian



Get:1 http://security.debian.org/debian-security stretch/updates InRelease [94.3 kB]                                                                                         
Ign:2 http://ftp.us.debian.org/debian stretch InRelease                                                                                                                      
Hit:3 http://ftp.us.debian.org/debian stretch-updates InRelease                                                                                                              
Hit:4 http://ftp.us.debian.org/debian stretch Release                                                                                        
Hit:6 http://www.deb-multimedia.org stretch InRelease                                          
Get:5 http://download.opensuse.org/repositories/multimedia:/xiph/Debian_9.0 ./ InRelease [1,526 B]
Err:5 http://download.opensuse.org/repositories/multimedia:/xiph/Debian_9.0 ./ InRelease
  The following signatures were invalid: EXPKEYSIG 77EC2301F23C6AA3 multimedia OBS Project <multimedia at build.opensuse.org>
Reading package lists... Done
W: GPG error: http://download.opensuse.org/repositories/multimedia:/xiph/Debian_9.0 ./ InRelease: The following signatures were invalid: EXPKEYSIG 77EC2301F23C6AA3 multimedia OBS Project <multimedia at build.opensuse.org>
E: The repository 'http://download.opensuse.org/repositories/multimedia:/xiph/Debian_9.0 ./ InRelease' is no longer signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.

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