> So Macs are out of question... Can't be signed can they?
... you know that even Apple ships some GPL software on every Mac right ? GPL is 100% fine mac hardware. There are even GPL apps on the appstore. Signing does not prevent you to upload a new version of the app to your own device.
> Am very surprised, after reports a while back of GPL (etc) apps not being approved.
it was an issue until Xcode 7 : prior to that you had to pay 99$ to Apple for the right of uploading something to your own iDevice. Since Xcode 7 this is not necessary anymore.
> Apple ships some GPL software on every Mac right [..] re are even GPL apps on the appstore.
To my knowlage and IANAL, this is only possible with older pre-v3 licenses. v3 licenses specifically prohibit tevoisation, something that Apple's App store TOS effectively mandates by placing restrictions on what App users are allowed to do. I believe this is why apple doesn't ship recent versions of Bash.
While users are still allowed to run software of their choosing on the Mac I would think it would be perfectly acceptable to provide software that could be built and run outside of the mac app store.
... you know that even Apple ships some GPL software on every Mac right ? GPL is 100% fine mac hardware. There are even GPL apps on the appstore. Signing does not prevent you to upload a new version of the app to your own device.