BSkyB and the English Premier League say they will pursue publicans showing football matches on the cheap, despite a legal victory for an English pub which screened them via a Greek network.
On Friday the High Court in London overturned the conviction of Portsmouth publican Karen Murphy.
She had been ordered to pay almost £8000 in fines and court costs for using a foreign decoder to access English games shown live in Greece.
Mrs Murphy won a partial victory last October in the European Court of Justice, which said it was not illegal to import a foreign decoder.
However, a related test case has asserted that the Premier League retains copyright control over some of the material that goes on screen during matches.
BSkyB had already started writing to publicans warning them against using imported foreign broadcasts.
BSkyB has an estimated 44,000 pubs, clubs and office customers for its Premier League soccer services, who each pay around £1000 per month.