Monitoring of telecommunications and data signals for others for quality control purposes; electronic monitoring of telecommunications and data signals for others to prevent unauthorized access to electronic data and information; recording and logging data signals for others on optical, digital and magnetic media for electronic storage

'access':25 'control':11 'data':5,18,28,34 'digit':40 'electron':13,27,45 'inform':30 'log':33 'magnet':42 'media':43 'monitor':1,14 'optic':39 'other':8,21,37 'prevent':23 'purpos':12 'qualiti':10 'record':31 'signal':6,19,35 'storag':46 'telecommun':3,16 'unauthor':24

PTTREC

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