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YouTube's latest app update for Android appears to support speculation the internet giant is set to charge visitors to view some video.
The update includes code which tells users ' You can only subscribe/subscriber to this paid channel on your computer', according to Android news site AndroidPolice.
Speculation has been mounting that Google is interested in a move to paid channels on YouTube.
AdAge said last month YouTube had contacted a small group of channel producers asking them to submit applications to create channels viewers would have to pay to access.
It appeared the first paid channels would cost between $US1 and $US5 a month, it reported.