I am using the first time the open-source library. I have to export some files of costumer as a ZIP, seems the ZIPFoundation looks great to use it. I read the license which wrote it is free, but the line which wrote:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
It means I have to add in code or I have to show alert to end user when using zip, that copy right belong to this person (seems strange but I want to be sure :) )