Protected full calf is a full grain semi-aniline leather : a thin surface coating enables to protect the color, makes your item more resistant to water, and gives it a subtle shiny aspect.
Patina on semi-aniline leathers is likely to be more uniform, slighter and to take longer than on aniline leathers. Stains, scratches and patina still belong to the normal ageing process of your item. Differences in tone, shading, gradation, and the possible alterations of the material are to be regarded as a sign of quality.
Overtime, Protected full calf can have a tendency to get dry. Try to hydrate it with a special cream for leather, knowing that semi-aniline leathers are less inclined to absord watery substances.