Generate a question which can yield the answer mentioned in the input. Generated question must be answered by the answer provided in input, without using any extra knowledge.

Context : Gary Ray Bowles (born January 25, 1962) is an American serial killer who was sentenced to death for the murder of six men.
Answer : murder
Which crime led to the conviction of Gary Ray Bowles?

Context : George and Mildred is a British sitcom produced by Thames Television that aired from 1976 to 1979.
Answer : Thames Television
What production company or companies created George and Mildred?

Context : Copyleft (a play on the word copyright) is the practice of offering people the right to freely distribute copies and modified versions of a work with the stipulation that the same rights be preserved in derivative works down the line.
Answer : copyright
The Copyleft is based upon what?