1. A method for correcting digital pen strokes, the method comprising: using a computer to perform the follow steps: accessing a stroke collection file comprising data corresponding to a plurality of pen strokes written on a paper form using a digital pen; determining a first set of coordinates in the stroke collection file corresponding to a removal stroke, the removal stroke written on the paper form so as to identify a corresponding mistake stroke written on the paper form; determining a second set of coordinates in the stroke collection file corresponding to the mistake stroke; determining a third set of coordinates in the stroke collection file that corresponds to a correction stroke written on the paper form using the digital pen so as to intersect with the removal stroke; and removing the first set of coordinates and the second set of coordinates from the stroke collection file.