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the What is free software page on the gnu.org web site states among others:

»An example of such an acceptable rule is one saying that if you have distributed a modified version and a previous developer asks for a copy of it, you must send one.«

I like this clause, but I do not know how to add it in my licensed software. I don't think this is included in any version of the GPL license, or did I miss something?

  • You're asking two different questions here. Which one do you want answered? – Robert Harvey Jun 19 '16 at 15:31
  • oh, I did not mean to ask two questions (one of which quite huge), the first question mark was just part of the name of the web page I was referring to. I removed it. – mariotomo Jun 19 '16 at 18:25
  • it's not about the question mark. Your first question is: "How do I make sure I receive modified versions of my GPL software?" Your second question is "How do I add a clause to the GPL?" Which one do you want answered? The GPL already requires that, if you modify the software, you make the modified version available to other users anyway, so I'm not exactly sure what it is that you're asking here. Do you want to be notified of changes? – Robert Harvey Jun 19 '16 at 18:37
  • Further, the rule you cited addresses the manner in which such changes are distributed. Does it really matter how you get the changes, as long as you get them? – Robert Harvey Jun 19 '16 at 18:45
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    »you make the modified version available to other users« - this does not necessarily include previous developers, does it? (and the clause applies only to 'distributing' the software, not just modifying it for your own use, or internal use of the company where you happen to work.) – mariotomo Jun 19 '16 at 23:20

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