but the end user access the content for free!
and why would it then been sold with a regular license? then all these kind of themes and scripts only be sold with extended licenses because a regular license would be useless.
take the question of the starter of this thread with a job-board is the same as a classified ad listing site.
Other example! Ads pro plugin and the extension, these where only made by the author to sell ads on your site.
But is sold with regular license, that make no scenes then!