I have recently adjusted a function from an existing package in R, which is licensed under GPL (>=2). If I now put the adjusted function in a package, so that other people can use it, do I have to put GPL (>=2) in the license field?
I have read the document on http://www.gnu.org/licenses/quick-guide-gplv3.html and if I understand it correctly, you can adjust software that was licensed under GPL and the GPL license directly transfers from the original software to the software that you adjusted.
Is this really all I have to do? I would think that you would have to contact someone in order to get your software licensed.