I believe a recent change to Tony rules is that voters must have seen all the nominees in a category to vote in that category.
As the previous poster said, that has always been the rule, but only recently did they implement a system that allowed them to actually enforce that rule.
A few years ago, after SCOTTSBORO BOYS closed so early in the season and then received a bunch of nominations, the producers invited Tony voters to scheduled viewings of the archival recording at the Performing Arts Library. I assume that would have counted and voters who attended one of the library viewings would have been allowed to vote. But that was before the new system, so nothing would have stopped voters from voting in those categories anyway. If that situation happened again, I honestly don't know if it would be allowed under the new system, but I hope so, as it is a way for closed shows to have a chance. Of course seeing the show live is always better, but a tape is better than nothing.
Nothing matters but knowing nothing matters. ~ Wicked
Everything in life is only for now. ~ Avenue Q
There is no future, there is no past. I live this moment as my last. ~ Rent
"He's a tramp, but I love him."