A group representing UK media companies has called on the BBC Trust not to allow adverts to be published on its international websites.
The British Internet Publishers Alliance (BIPA) said the plan would hit revenue its members could make online.
Showing adverts to non-UK readers of BBC websites would also undermine the BBC’s "worldwide reputation for integrity and impartiality," it added.
The BBC argues that readers outside the UK should contribute towards the costs.
While UK users pay for the website through their licence fee, international audiences are getting the service for free, the corporation says.
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