If I have a program that consists of 5 files each of which is exactly 2000 lines lone and I distribute under GPLv2 or later. You like my program but realize tha

If I have a program that consists of 5 files each of which is exactly 2000 lines lone and I distribute under GPLv2 or later. You like my program but realize that you have a novel new algorithm that will speed up the core functionality of my program by 300% and your algorithm only needs 100 new lines in one of the source files. You are totally free to add your hundred lines under terms that are compatible with my original license. You cannot proceed to remove or change my headers that specify my copyright and my license terms to the 10,000 lines of code of which I am the sole copyright holder.