Electronic Design: Linux: From Academics To The Real World

“Today, Linux, a spry seven-year-old operating system (OS),
is considered the fastest-growing OS in the world.”

“The applications, enablers, communication software, or
utilities that run on Linux can be sold for any price that the
market will bear, and source code doesn’t need to be distributed.
The GPL’s requirement is that any code that is licensed under the
GPL must stay under it…”

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