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I'm working on a fork of a project under the GPL that hasn't been maintained for over a year. How do I handle the copyright notice?

Here is the copyright notice how do I add my copyright?

Copyright © 2013–2014 Philipp Emanuel Weidmann (pew@worldwidemann.com)

Final Term is free software: you c...

I have made a lot of changes and have many new features planed, I'm estimating around 60% of the code base will be different/new.

marked as duplicate by gnat, user22815, amon, Telastyn, user40980 Nov 2 '15 at 0:12

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As long as the tiniest bit of code remains from the original maintainers, you must keep their copyright intact, but you may add your own on a separate line, like so:

Copyright © 2013–2014 Philipp Emanuel Weidmann (pew@worldwidemann.com)
Copyright © 2015 RedHatter (redhatter@example.com)

Final Term is free software: you c...

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