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Kettell Video Productions was targeted by tech scammers who infected its IT systems with viruses before demanding £ 1,000 in online currency Bitcoins or the files would be permanently deleted .
 ( ransom: demanding,  £ 1,000: price, in online currency Bitcoins: payment method, infected its IT systems with viruses: attack pattern, Kettell Video Productions: victim, tech scammers: 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: demanding,  £ 1,000: price, in online currency Bitcoins: payment method, infected its IT systems with viruses: attack pattern, Kettell Video Productions: victim, tech scammers: attacker) 