Caldis
License considerations
https://creativecommons.org/faq/#can-i-apply-a-creative-commons-license-to-software
Please reconsider the license chosen for the source code of the project.
@HarukaMa Thanks for your suggestion, this project started on a boring weekend when it didn't take much time on the choice of the certificate, so it has been used until now. I will consider replacing the certificate with GNUv3 in a later version.
You should not wait to do this. Since this project has merged code from other contributors, you must get the explicit, written permissions of ALL of them to change the license. If a contributor cannot be contacted, you cannot legally relicense their code!
So as this project grows, and as more contributors add code, the number of people who need to grant permission to change the license will increase.
Please change the license today, and get all of the existing contributors to agree to change the license to GPLv3. Waiting will only make this much more difficult!
And since you added this line to the license:
And you can not upload it to the App Store.
For all of the code that contributors have given to this project, this license applies to YOU, @Caldis. So YOU cannot legally upload versions of this that contain their contributions to the App Store!