Jeremy Hammond has spent two birthdays in captivity now since his conviction, but his friends have promised to celebrate each one. As with many political prisoners, his supporters send him cards, but they’ve also invented a new tradition: turning his birthday party into political protest against his enemies.

Hammond was sentenced to a decade’s imprisonment in November 2013 for his part in the hack of Strategic Forecasting Inc., or Stratfor, an Austin, Texas-based private intelligence agency. As part of LulzSec, an infamous collective from the Anonymous movement, Hammond liberated 5 million emails and the credit card numbers of Stratfor’s clients, which included government and military officials. The emails became part of a searchable archive on Wikileaks called the Global Intelligence files, while Anonymous used some of the credit card numbers to charge donations to charity.