Thursday Morning Riddle

I’m delivering blows with a sharp heavy blade;
I’m a writer who writes so he’ll quickly get paid;
I’m a license for cabbies to practice their trade;
And I’m breaching a server to alter your grade.

Who am I?

UPDATE: Riddle solved by Asher. See comments for answer.

2 Responses to “Thursday Morning Riddle”

  1. Asher Says:

    Hack

  2. Bill Says:

    HACK is correct. Way to go, Asher!

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