Comment by adolph

From: https://fossa.com/blog/open-source-licenses-101-apache-licen...

  Anyone who uses open source software licensed under Apache 2.0 must include the following in their copy of the code, whether they have modified it or not:

  1. The original copyright notice
  2. A copy of the license itself
  3. If applicable, a statement of any significant changes made to the original code
  4. A copy of the NOTICE file with attribution notes (if the original library has one)

[...]

  However, you do not need to release the modified code under Apache 2.0. Simply including any modification notifications is enough to comply with the license terms.