original: 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.
simplifications: Stallman created the idea of copyleft and is the main author of several copyleft licenses. The GNU General Public License is the most used free software license. Stallman was first to create several copyleft licenses like the GNU General Public License. It is the most widely used free software license. Stallman created copyleft and is the author of several of it's licenses, including the General Public License. Stallman pioneered the concept of copyleft. Stallman is the main author of several copyleft licenses. These licenses include the most widely used free software GNU General Public License. Stallman pioneered the idea of copyleft. He is the main author of several copyleft licenses, including the GNU General Public License, the most used free software license. Stallman created the concept of copyleft and wrote several copyleft licenses. Stallman pioneered the concept of copyleft and authored several copyleft licenses like the GNU General Public License, the most widely used free software license. Stallman started the idea of copyleft and is the founder of several copyleft licenses including the GNU General Public License, the most used, free software license. Stallman started the concept of copyleft. He is the main author of several copyleft licenses. This includes the GNU General Public License. It is the most widely used free software license. Stallman has pioneered the idea of copyleft and is the main author of a few copyleft licenses, including the GNU General Public License, the most widely used free software license.