Does Doctor Have Killing License?

I was upset when our Deputy MOH claimed that doctors actually "have the license to kill". Well, may be he tried to say that doctors may have the right to decide when to stop resuscitation (which does not equal to "killing" someone) when they feel the chance of survival is dim. However, this doesn't mean that doctor has the "killing license" to cover his negligence upon patient's death.
As a doctor, I've encountered many death which sometime I/my colleagues suggest to family members for No Active Resuscitation as the prognosis was poor. Sometime they agree, sometime they don't. However, so far I haven't encounter any miracle, all passed away inevitalby.
Sometime, I learn from previoius patient's death and choose another type of treatment when encounter similar clinical picture and sometime the patient survived. The previous death do help me to improve my judgement to handle similar problems in the journey of practising medicine. However, I wouldn't agree that this is so called " Killing License".
So, do u think that doctors have killing license? Share with me please.