Ysbïwriaeth
Casglu cudd-wybodaeth heb ganiatâd perchennog y wybodaeth yw ysbïwriaeth neu ysbïo.
Mae'n ddull o weithredu cudd, ac mae'r wybodaeth a enillir yn enghraifft o gudd-wybodaeth ddynol (HUMINT).
Gweler hefyd
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