Can I sell this plugin or give it away?

No, you cannot sell it, but we are working on an affiliate program. If you are interested, contact us. You are not allowed to pass on the plugin to third parties. The license becomes automatically void when you become insolvent or in case you leave this Earthly paradise. It cannot be sold as an asset of your business. This means, when you sell your site, the plugin is not included and the new owner needs to buy a license.