I am theme developer and I want to make a "demo" website, where people to which I give password will have access to nearly all theme functions (except theme editor) -> they won't have full admin rights. They will use it only to evaluate theme. Problem is that, I don't want to them to have the right to a have copy -> to not distribute theme to them.
My question is whether using customizer and theme options counts as redistribution, therefore use of GPL which force me to give them the source code which I don't want to.