Later, Linux matured and additional Linux kernel development happened on Linux systems. Torvalds initiated a change from his unique license, which prohibited industrial redistribution, to the GNU GPL. Developers labored to integrate GNU elements with the Linux kernel, making a fully practical and free operating system. Due to an earlier antitrust case forbidding it from coming into the pc business, AT&T was required to license the operating system’s source code to anybody who requested. As a result, Unix grew rapidly and have become broadly adopted by tutorial establishments and businesses. In 1984, AT&T divested itself of Bell Labs; freed of the legal obligation requiring free licensing, Bell Labs began promoting Unix as a proprietary product, where customers were not legally allowed to switch Unix. The GNU Project, started in 1983 by Richard Stallman, had the aim of making a “complete Unix-compatible software system” composed entirely of free software.
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