The Marine Broadcasting Offences Act reference article from the English Wikipedia on 24-Apr-2004
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Marine Broadcasting Offences Act

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The Marine, etc, Broadcasting (Offences) Act was introduced in the UK in 1967, and, broadly speaking, prohibits broadcasting (i.e. transmitting with the express purpose of making the broadcast generally available) from ships, aircraft, or marine structures unless in posession of a Post Office Licence to do so. The Act extended to the Channel Islands and the Isle of Man. It was aimed at offshore pirate radio stations such as Radio Caroline.