I think for practical reasons we should simply stay away from Tango. We'd be wasting time otherwise. It's not like they discovered the cure for cancer. We're better off just defining better abstractions; think of where Phobos was in comparison to Tango before std.algorithm came about.

In the date/time case, we should be looking for inspiration at Boost - work that's licensed under better terms, and of good quality to boot.


Andrei

On 04/29/2010 10:13 AM, David Simcha wrote:
On Thu, Apr 29, 2010 at 11:09 AM, Lars Tandle Kyllingstad
<[email protected] <mailto:[email protected]>> wrote:

    So that leaves the code.  Unless SHOO has copy-pasted the code from
    Tango, I cannot see how their claim holds any water.  There are only so
    many ways to figure out which day of the month it is.

    -Lars


Very good point.  I agree that we don't want to resort to splitting
legal hairs, but the relevant test is the
abstraction-filtration-comparison test.
(http://en.wikipedia.org/wiki/Abstraction-Filtration-Comparison_test)

Basically, this says that, since copyright protects only the expression
of an idea, not the idea itself, if two programs do something the same
way because that's the only reasonable way to do it then there's no
infringement.



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