In February 2011, BBC Four's Service Licence was amended to allow it to curate and publish archive content permanently online. The BBC Four Collections website features some of the best archive programmes for free online access by anyone in the UK.
You can read more about this process in the About the BBC blog site, in a blog post by the BBC's Director of Archive Content, Roly Keating on and the Army: A Very British Institution programme page.
If this did not answer your question, please advise what information you would expect to be provided.
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