1408
Two years ago Stuart Kettell ’s company Kettell Video Productions was targeted by hackers who encrypted all his files and demanded money to decrypt them .
 ( ransom: demanded money,  Kettell Video Productions: victim, encrypted all his files: attack pattern, hackers: attacker) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: phishing, data breach, ransom, discover vulnerability, patch vulnerability, Arguments type: vulnerable system, capabilities, vulnerability, number of victim, issues addressed, compromised data, damage amount, common vulnerabilities and exposures, victim, patch number, number of data, tool, discoverer, time, purpose, place, payment method, releaser, vulnerable system version, attacker, supported platform, patch, price, vulnerable system owner, trusted entity, attack pattern. 
Text: {0} 
Answer:
 ( ransom: demanded money,  Kettell Video Productions: victim, encrypted all his files: attack pattern, hackers: attacker) 