"Based on everything he's said and done, including bragging about what he was drawing in his cell, he obviously doesn't think child sexually abusive material is wrong," Denenfeld said.
"This isn't just virtual stuff; this is also real people being harmed."
Denenfeld found him guilty on three counts of child sexually abusive commercial activity and using a computer to commit a crime.
But Gobrick continued to maintain his innocence, calling Adolf Hitler's crimes during World War II "legal".
"Under the law, Auschwitz was legal," Gobrick said, in an apparent reference to the Nazi concentration camp in southern Poland.
Gobrick's criminal history also includes a 2001 New York conviction for sexual abuse.