My .02$: http://www.gnu.org/copyleft/licenses.html I have had reason to read the GPL and LGPL carefully and I also had our lawyers look at it. If you need to understand take your time to read the license terms. They are not particularly complicated but written in "legalese" (a strange language that requires you to use and define certain terms and phrase our sentences in order to impress outsiders ;-). Many has pointed this out: * GPL allows you to modify the "program" (as defined in GPL) as you please. And use it, of course. * Unless you redistribute the "program" (as defined in GPL) you have no obligations to make your modifications public. * If you redistribute the "program" in object or executable format you must also make the modified source code available. There are also some requirements on marking the changes etc. in the source. * You may charge for "the physical act of transferring a copy" [GPL] and "offer warranty protection in exchange for a fee" [GPL]. You can however not prohibit anybody from buying one copy your software, make copies and sell them. The LGPL is a sligtly different version that is applied to libraries such as libc. This makes it possible to dynamically link to those libraries and still not require your software to be GPLed. Or put in other words: you can include header files in your non-GPLed code. There is (or maybe was) a small controversy regarding kernel modules in Linux. My interpretation is that kernel modules are does not have to be GPLed. I believe that this view is supported by Linus himself but I have no hard proof for this. /Fredric PS. We use Linux in our pick-and-place machines. For the curious: http://www.mydata.se We may also have job openings for one (or two) software engineers (in Stockholm, Sweden).
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