Subscriptions.
Subscription feeds are designed so that subscription fees are charged for unique quality content. Publisher include teaser copy in the RSS feed and readers have to purchase a subscription to see the content in its entirety. The New York Times was the first to introduce the subscription model. Initially the NY Times faced some resentment from users who had become accustom to free RSS based content, but ultimately consumers realize that businesses must achieve profits in order to continue.
Profiting from RSS Feeds
Source: http://www.rss-specifications.com/profiting-from-rss.htm
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