Jim is correct for a *subscription* for OneCare. However, the beta subscription was tied to the beta environment and the beta download is no longer available. The beta subscription was shown, for testing purposes, as expiring late in 2008, but the reality is that the beta software will cease updating much earlier. Now that you have installed the final of OneCare 2.0, you will be using the trial until you activate with a paid subscription or you purchase OneCare.
-steve