Modifications to the Apostolic Constitution Universi Dominici Gregis that regulates the Papal Conclave, as explained in English by Vatican Insider, with three main changes highlighted :
1. Conclave can begin earlier than 15 days after the vacancy of the See of Rome, but the exact date depends entirely on the College of Cardinals.
2. Cardinal-electors can opt not to attend the Conclave based on health and other valid reasons, but otherwise, all electors should attend, and those with the rights should not be impeded attendance at the Conclave.
3. All people locked inside the Conclave, including even the laity must take the oath of secrecy, the same as that of the Cardinals. More specific latae sententiae excommunication is given immediately to those who broke the oath during and even after the Conclave, unless permission given by the new Pope.
petercanisiusmichaeldavidkang 