Daniel Morcombe's killer Brett Peter Cowan set to appeal murder conviction

Seven months since a jury found Brett Peter Cowan guilty of Daniel Morcombe's murder, 9NEWS can reveal his appeal against that conviction will be heard at the end of next month.

Cowan's legal team is relying on a Canadian precedent in their bid to have the murder conviction quashed.

The famous video confession to undercover police officers that sealed Cowan's fate now could be used to set the killer free.

Cowan's lawyer Tim Meehan told 9NEWS a retrial would change his client's life "incredibly".

"He's very happy that we've got a date, he's very keen for the appeal to run," Mr Meehan said.

"Really the centre-point of the whole argument is the admissions that Brett made to the undercover officers should never have seen the light of day.

"They should never have been played to the jury."

Cowan's confession was recorded in an elaborate undercover police sting in which detectives posed as a group of criminals – one a crime boss.

To join the club Cowan had to confess anything that would incriminate the gang.

The investigation technique, called "Mr Big", was developed in Canada and used by police to catch killers there since the 1990s.

But a recent decision by Canada's High Court over a similar case, where an accused killer was given a retrial, has given Cowan's legal team hope.

9NEWS can reveal Cowan's appeal will be heard on November 26 and 27, but Daniel Morcombe's parents are not fazed by the prospect.

"Look to be honest we're quite comfortable with the appeal process," Daniel's father Bruce said.

"We knew it was going to happen."

At the same time of Cowan's appeal against his conviction the Queensland Attorney-General will be appealing his sentence, arguing Cowan's 20-year sentence is inadequate.