This week's shake-up in the country's laws will make it easier for people - including official suspects in a case, like the McCanns - to access police investigation files.
Previously, all information in police files had to remain secret. But the McCanns have told Sky News Online the overhaul will not lift the veil on documents concerning their daughter's disappearance.
Family spokesman Clarence Mitchell said the couple had been informed by the Portuguese legal system that it would not apply to "complex" cases like Madeleine's.
The McCanns had hoped the change would end the rumour and speculation that has surrounded the police inquiry. (Sky News)