The NFL's defense asserts that there is no legal precedence for a court to issue an injunction to stop the lockout. They've backed it up by citing the Norris-LaGuardia Act of 1932, an act that basically bars federal courts from issuing injuctions against non-violent labor disputes.
Here's what Judge Nelson had to say about that: (and read that linked article please)
Isn't there some bit of irony that the Norris-LaGuardia Act is designed to protect employees from strike-breaking federal judges, should now be used to prevent an injunction of a wealthy, multi-employer unit seeking to break players who are no longer in a union?
Just for the record - I'm not necessarily on either side, the players or the owners, I just want them to get back to the negotiating table, and now, and figure this crap out so we can all sleep at night knowing there will be a season. Hopefully Judge Nelson's stance will help in this.