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Stallman issued a manifesto: “I consider that the Golden Rule requires that if I like a program I must share it with other people who like it. Software sellers want to divide the users and conquer them, making each user agree not to share with others. I refuse to break solidarity with other users in this way. . . . Once GNU is written, everyone will be able to obtain good system software free, just like air.”123
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Walter Isaacson (The Innovators: How a Group of Hackers, Geniuses, and Geeks Created the Digital Revolution)
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Torvalds decided to use the GNU General Public License, not because he fully embraced the free-sharing ideology of Stallman (or for that matter his own parents) but because he thought that letting hackers around the world get their hands on the source code would lead to an open collaborative effort that would make it a truly awesome piece of software. “My reasons for putting Linux out there were pretty selfish,” he said. “I didn’t want the headache of trying to deal with parts of the operating system that I saw as the crap work. I wanted help.”136
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Walter Isaacson (The Innovators: How a Group of Hackers, Geniuses, and Geeks Created the Digital Revolution)
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The OS model has a natural overlap with much of the founding philosophy of 3D printing and is exemplified by pioneers RepRap. They have fully adopted the OS model and make their software available under a GNU license and include the .stl files for their devices with the sale of any printer. This allows the purchaser to reprint their device and pass it onto a friend.
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Aaron Council (3D Printing: Rise of the Third Industrial Revolution (Gyges 3D Presents))