Spanish doctor Eufemiano Fuentes, the central figure in the Operation Puerto cycling doping probe, has been given a one-year prison sentence for crimes against public health.
Fuentes was also barred from practicing sports medicine for four years and received a fine.
The judge ruled that evidence from the case, including blood samples, will not be released to national and international anti-doping authorities for probes into cases outside cycling.
As Spain's current anti-doping legislation was not in force in 2006 when police seized anabolic steroids, transfusion equipment and blood bags in raids, Fuentes and four others were tried only for violating public health regulations.
The Puerto case attracted international attention because some of Fuentes's clients were successful professional riders, including American Tyler Hamilton who gave evidence in February.
Fuentes, who denied doping, said in his opening testimony he also had clients in sports including soccer, tennis, athletics and boxing.