Moreover (and more directly related to the actual article) it is true that the GPLv3 provides more clarity on what constitutes a derivative work: https://www.i

Moreover (and more directly related to the actual article) it is true that the GPLv3 provides more clarity on what constitutes a derivative work: https://www.ibm.com/developerworks/rational/library/edge/08/mar08/curran/curran-pdf.pdf https://www.ibm.com/developerworks/rational/library/edge/08/... > GPLv3 adds more clarity with regard to what constitutes a derivative work. For example, GPLv3 states that if the program is "specifically designed" to work with a GPL-governed library, then the library is considered part of the overall work and the entire application is governed by the GPL. However, if one could swap out the GPL library for another library (i.e., if the application wasn't "specifically designed" to work with the GPL library), then it's not part of the overall work and would not be governed by the license.