GPL GWNUM

lavalamp · 2020-12-10, 11:10

Is there an up to date GPL version of the GWNUM code?

I ask because I have seen GMP-ECM output from others recently which uses the GWNUM library, but in all cases the output carries the message that the binary should not be distributed due to incompatible licenses. If possible I would like to create a binary that does not have this issue.

Back in 2006 this post suggests such a goal used to be possible:

Quote:

Originally Posted by Prime95

1) If you want to link gwnum into gmp-ecm (using the as-yet-unreleased next version of GMP-ECM), then you need a GPL version of gwnum. Look at ftp://mersenne.org/gimps. There are 3 GPL'ed libraries there.

What is the difference between the GPL and non-GPL compatible versions of the GWNUM code (if any and if such versions exist)?

Happy5214 · 2020-12-10, 11:55

The prize distribution rules that users of GWNUM are bound by if they find a Mersenne prime using the library make it incompatible with the GPL, as that is a restriction on use beyond that permitted by the license. George can easily make a GPL-compatible version available if he so chooses, as he is the author.

Prime95 · 2020-12-10, 19:26

Quote:

Originally Posted by lavalamp

Is there an up to date GPL version of the GWNUM code?

Nope.

lavalamp · 2020-12-11, 01:20

mathwiz · 2020-12-11, 02:16

Quote:

Originally Posted by Prime95

Nope.

Would it be feasible to break out just the code used by GMP-ECM (gwnum stage1) into a GPL'ed library? Or is it too intertwined with the rest of the code?

Prime95 · 2020-12-11, 05:50

Yes it is feasible. Not high on the priority list.

Most of the few users that are interested in GMP-ECM w/GWNUM have managed to build the executable. Most notably, ryanp.

lavalamp · 2020-12-11, 07:53

I would be willing to help out with that if you were looking for someone to delegate to.

Here's my CV; I am relatively proficient in C++ which is at least sort of like C, and my IQ is positive.

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2020-12-10, 11:55	#2
Happy5214 "Alexander" Nov 2008 The Alamo City 3·163 Posts	The prize distribution rules that users of GWNUM are bound by if they find a Mersenne prime using the library make it incompatible with the GPL, as that is a restriction on use beyond that permitted by the license. George can easily make a GPL-compatible version available if he so chooses, as he is the author.

2020-12-11, 01:20	#4
lavalamp Oct 2007 Manchester, UK 53C₁₆ Posts

2020-12-11, 05:50	#6
Prime95 P90 years forever! Aug 2002 Yeehaw, FL 2²×11×167 Posts	Yes it is feasible. Not high on the priority list. Most of the few users that are interested in GMP-ECM w/GWNUM have managed to build the executable. Most notably, ryanp.

2020-12-11, 07:53	#7
lavalamp Oct 2007 Manchester, UK 2²·5·67 Posts	I would be willing to help out with that if you were looking for someone to delegate to. Here's my CV; I am relatively proficient in C++ which is at least sort of like C, and my IQ is positive.