I made an application with Processing that I exported to a .app file. It works just fine on my computer. When I download my app from the Internet and try to open it, I get the following message: 

> 
> MyApp.app is damaged and can't be opened. You should move it to the trash.
> 
> 
> 

As [users on this site](https://apple.stackexchange.com/questions/215332/many-os-x-app-store-apps-are-listed-as-app-is-damaged-and-cant-be-opened?lq=1) have noticed, many Apple certificates expired on 11/11/2015, making it impossible to run these applications if Gatekeeper is enabled. Processing seems to be signing with expired signatures as well. How do I remove these signatures?