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Re:Afl-fuzz: making up grammar with a dictionary in hand by ehntoo on Wednesday April 15, 2015 @08:55AM (#9380614)
IANAL, But from the readme [1], it's Apache Licensed, so fork away - just make sure you retain their copyright notices and follow the rest of the license.

-edit- In addition, the bottom of the README which you quoted just mentions the need to sign a CLA if you want your code pushed upstream. See the FSF page about why they require copyright assignment [2] for their projects for some background.

[1] http://lcamtuf.coredump.cx/afl/README.txt [2] https://www.gnu.org/licenses/why-assign.html

Re:Afl-fuzz: making up grammar with a dictionary in hand by emaste on Wednesday April 15, 2015 @02:03PM (#9382855)
Note that the Contributor License Agreement (CLA) and copyright assignment are rather different things. Google and the FSF have very different reasons for requiring their respective arrangements.