In this task, you're given a sentence and your task is to generate a simplified sentence that focuses on lexical paraphrasing from the original sentence given in the input.
Q: stallman pioneered the concept of copyleft and is the main author of several copyleft licenses including the gnu general public license , the most widely used free software license.
A:
stallman pioneered the copyleft concept and holds the license to the most popular free software license , the gnu general public license.