Any authentication domains for paid templates and extensions Joomla - is required! Joomla, like many other chelovekodruzhelyubnye CMS, released under the GPL license , and that there did not invent the developers of extensions for Joomla, they never fail to attract one or punished for " not legal " , in their view , the spread of extensions. Still do not understand why? Because Joomla = under the GPL license. (Joomla is free, open, and available to anyone under the GPL license. Read more ...) .