Paolo, you can safely *remove* packages from the archive without changing the signature of the release files. You must only re-sign the release files if you are *adding* packages. (the client will get an error if it believes the missing packages exist and tries to download them, but that's a separate problem.)
Paolo, you can safely *remove* packages from the archive without changing the signature of the release files. You must only re-sign the release files if you are *adding* packages. (the client will get an error if it believes the missing packages exist and tries to download them, but that's a separate problem.)