On Tue, May 5, 2009 at 9:33 PM, Brian Granger <ellisonbg....@gmail.com> wrote: > >> The Sage worksheet at >> >> http://abstract.ups.edu/sage-aata.html >> >> contains Sage code that was not written in a notebook. While that >> could be obvious if you actually looked at the file, technically I >> think there is no way to prove just where I wrote it - notebook or >> not. > > Regardless of the how you wrote this, many people would consider your > worksheet a derived work of Sage and thus say that your current > license (CC) violates the GPL.
If people think that then I believe they are wrong. (I haven't looked at the worksheet but I assume it is a worksheet Rob created himself from scratch and not containing a modification of someone elses.) Sage functions in a simailr way that GIMP does. If I create an image in GIMP from scratch then I own the copyright to that image. The license of GIMP, which functions as an editor, a viewer, has it's own plugins for postprocessing, ... have nothing to do with it. In general, to function as a derived work requires that you modify a certain number of lines in the codebase of the software. I think the GPL FAQ has about 30-50 (I don't remember exactly). So if Rob had about 50 lines from the Sage source in his worksheet, that would require him to license it under the GPL. > >> So originally, I had a copyright interest in this work. > > Copyright is different from license. You most likely still have full > copyright over the work. > >> I could have >> kept it that way, made it GFDL (or GPL), or use CC (which I did). So >> I understand the answer to be that you can do whatever you wish with a >> Sage worksheet (the notebook is the interface), no matter what you >> (legally) place in it that you have the rights to. > > Possibly, which is part of my original question, but your example > brings up a different issue. If you have Sage code (regardless of the > interface) it is likely a derived work of Sage and thus bound by the > GPL. > > > > --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to sage-devel@googlegroups.com To unsubscribe from this group, send email to sage-devel-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://www.sagemath.org -~----------~----~----~----~------~----~------~--~---
