GPL prohibits restricting the code in any way. You can restrict the support or non GPL parts of the plugin (images/css) to a single domain but you can’t restrict the GPL code to a single domain.
MATT MULLENWEG’s response to the same question:
GPL prohibits restricting the code in any way. You can restrict the support or non GPL parts of the plugin (images/css) to a single domain but you can’t restrict the GPL code to a single domain.
MATT MULLENWEG’s response to the same question: