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While Sony eventually recalled the CDs that contained the XCP system , the web-based uninstaller was investigated by noted security researchers Ed Felten and Alex Halderman , who stated that ActiveX component used for removing the software exposed users to far more significant security risks , including arbitrary code execution from websites on the internet .
 Sony, Ed Felten
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Sony, Ed Felten