From a press release issued by FGSport:

2004 FIM WORLD SUPERBIKE CHAMPIONSHIP

11th round Magny Cours, 1-3 October 2004

Tyres Check on 2005 SBK and WSS World Championships machines

In the 2005 World Superbike and World Supersport Championships a new tyre check system will be implemented. Under the supervision of the Technical Director, immediately before the start of the event, each team will be given a set of stickers. These stickers will be equal in number to the number of tyres allowed. It will be the duty of the teams’ mechanics to place these stickers on the side of the tyres before they are used on the track. These stickers will be made using an exclusive type of technology specifically realized for this purpose. The stickers will bear a number that identifies the rider (different to his official starting number) and will be changed for each race.
FIM checks will take place both in the pit lane and at the single tyre supplier technical area..

Magny Cours, 3rd October 2004