My doubts about Free Software Licenses

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http://www.linuxquestions.org – Hello all! My question is about the Free Software Licenses. I start by saying that I haven't got any experience with them and I would like to ask for some clarification on the basic concepts. Taking as an example the GNU General Public License version 3 (GPLv3) my first questions are: A) To apply the license to a software, is it enough to simply provide a copy of the license together with the software and "mark" every part of the software itself as suggested in the "How to Apply These Terms to Your New Programs" section of the License OR is it necessary to "register& (HowTos)