Questions about license (GPLv3) and copyright information

[myndcryme]

@synctext

I know that the Tribler/software-based-PUF includes a copy of the GPLv3 license here: https://github.com/Tribler/software-based-PUF/blob/master/LICENSE but the FSF recommends, "You should put a notice at the start of each source file, stating what license it carries, in order to avoid risk of the code's getting disconnected from its license."

https://www.gnu.org/licenses/gpl-faq.html#NoticeInSourceFile

I think each Tribler/software-based-PUF code file should display a license notice and I can add notices with copyright info accordingly. I would like to credit the original author for his code adding a Copyright, but I read, "The case when someone else might possibly claim the copyright is if you are an employee or student; then the employer or the school might claim you did the job for them and that the copyright belongs to them." https://www.gnu.org/licenses/gpl-faq.html#HowIGetCopyright

So, I need to ask who owns the Copyright? Ade Setyawan Sajim or Delft University of Technology? Regards, myndcryme.