Expired GPG keys of older release

[Adam Cecile <adam.cecile@hitec.lu>]

Hello,


GPG key that signed the Squeeze repo is now expired. How should I handle 
this properly ? Despite the key is expired, it use to be valid and I 
don't like much the idea of going for [trusted=yes] for each impacted 
sources.list entry.

Thanks in advance,


Adam.