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The puzzling part about Ransomware is that , no matter what the situation is , even if the ransom is paid , there is no guarantee that computer users will be able to fully access their systems ever again .
 ( ransom: the ransom is paid,  Ransomware: tool, computer users: victim, their systems: victim) 
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: the ransom is paid,  Ransomware: tool, computer users: victim, their systems: victim) 