Disclaimer: I am not a lawyer. Not the way I understand it, but I suppose it matters what you mean by create.
If you use Sage(Math) to derive a formula that you then incorporate into your commercial closed-source program, I think the answer is, that's OK. If you use your commercial closed-source program to access SageMath, or Sage that's OK also. Otherwise you would not be allowed to acess Sage from Windows. If you take the source code for Sage and hide it inside your commercial closed-source program, you are probably violating the GPL terms. And as William says, you can always try to sell something that is GPL free. Of course, I once again remind you, I am not a lawyer. RJF On Tuesday, August 16, 2016 at 10:02:16 PM UTC-7, William wrote: > > > http://ask.sagemath.org/question/34442/can-i-create-commercial-software-using-sagemath > > > I put: "ANSWER: It depends on what you mean by "commercial software". > > ONE: If by "commercial software" you mean "closed source", then the > answer is no, you can't write and publicly distribute such software > legally. > > If you write a program that genuinely uses the Sage library in a > nontrivial way, then that program is a derived work of Sage and must > be distributed under the GPL (after all, there is no possible way to > run the program without calling many functions in Sage). > > When I started Sage, I took PARI -- a GPL'd program -- and started > building Sage on top of that. I was forced to GPL Sage because it was > a derived work of PARI. It's the same principle at work. Sage is very > much a LIBRARY, not just a programming language. > > We (Sage developers) also cannot sell or provide you with an > exception, because Sage itself depends on many GPL'd programs that we > do not own the copyright to. > > TWO: If by "commercial software" you mean software that makes money", > then yes, it is possible to build commercial software on top of GPL'd > software such as Sage. E.g., SageMathCloud is commercial (it makes > money) but is GPL'd. The Linux operating system is also GPL'd but > there are companies (like RedHat and Ubuntu) that make money from that > software." > > > -- > William (http://wstein.org) > -- You received this message because you are subscribed to the Google Groups "sage-devel" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-devel+unsubscr...@googlegroups.com. To post to this group, send email to sage-devel@googlegroups.com. Visit this group at https://groups.google.com/group/sage-devel. For more options, visit https://groups.google.com/d/optout.
