All these packages are signed with a gpg key. The key ID (97E9FE6C20ADFBAA) corresponds to the hosting provider (Equipe systeme du LIPN 38D092B4 (you can find some details here).
if apt-get update gives you warning about an unverified key such as NO_PUBKEY 97E9FE6C20ADFBAA, you can get it with (for example):
gpg --keyserver wwwkeys.eu.pgp.net --recv-key 97E9FE6C20ADFBAA gpg --export --armor 97E9FE6C20ADFBAA | sudo apt-key add -
Another possibility is to download the key file from this server and to type sudo apt-key add lipn-archive-keyring.key.
Note that you should really read the documentation about apt-key and gpg if you are concerned (and you should) by security and you do not understand what you do with the two lines above.
You should also install the lipn-archive-keyring package from this repository, but you will run into the chicken-and-egg problem if you skip the above indications.
You can examine the pool.
You can find information about this release. Please refer to it as such (for architectures amd64 i386):
deb http://debian.lipn.fr sid main non-free contrib deb-src http://debian.lipn.fr sid main non-free contrib
Home. Regenerated on 2010-06-28 at 11:39. Please contact Jean-Christophe Dubacq if you find any problem with these pages.
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