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He said that for the most part he simply sent print jobs using the Line Printer Daemon ( LPD ) , the Internet Printing Protocol ( IPP ) and the RAW protocol on communications port 9100 to printers that did n't require authentication .
 ( discover vulnerability: said that,  He: discoverer, printers: vulnerable system, the Line Printer Daemon ( LPD ): vulnerable system, the Internet Printing Protocol ( IPP ): vulnerable system, RAW protocol: vulnerable system) 
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:
 ( discover vulnerability: said that,  He: discoverer, printers: vulnerable system, the Line Printer Daemon ( LPD ): vulnerable system, the Internet Printing Protocol ( IPP ): vulnerable system, RAW protocol: vulnerable system) 