On Saturday, 15 April 2017 at 20:20:01 UTC, Bill Baxter wrote:
And more than that, companies that are serious about avoiding
litigation will make sure that everyone working on this new
project has not even seen the source code for the library with
the other license. If someone who has seen the source code
provides help, it will only be in the form of advice, not code,
to make sure there is no possible argument that the copyright
of the original was violated.
In the case of BLAS, there is a reference implementation in
Fortran which is free for commercial use. They only ask the
authors to be credited.
Of course, one should not look at other implementations...