The International Federation of the Phonographic Industries (IFPI), which represents the record industry worldwide, warned that manufacturers and sellers of pirate CDs were not their only targets.
IFPI spokesman Ion Stamboulis told the BBC: "This is not a symbolic measure. We are determined to prosecute the buyers and we have the support of the authorities."
The IFPI is struggling to fight against the sale of counterfeit CDs which, according to the group's Commercial Piracy Report 2003, have more than doubled in the last three years and now generate an illegal international business worth more than $4.5 billion.
The report found that within Western Europe, Spain, Italy and Greece are most badly affected by music piracy, with illegal CDs being sold openly on the streets. But authorities seem to be cracking down.
According to the BBC, this is the first time that Greek authorities have sent a purchaser to prison, although around 1,000 sellers have been prosecuted over the last two years.