Hate to be the bearer of bad news but the **** up that MS have created will probably end up having the plug pulled soon. The free subscription was aimed at IT pros who completed some surveys, for which they got a free 12 months Technet subscription. The proof of this is in the '1900' subscription expiry date. I wouldn't be surprised if the keys that have been given out end up being revoked, and the subscriptions that were created using the flaw being revoked too. It wouldn't be too hard to revoke the keys which have been generated.
As I am a paying member of Technet, I didn't bother trying the links. I was speaking to a mate at MS though this afternoon, and the fur has been flying today at MSHQ