The ornamental design for a digital contentplayer, as shown and described.
FIG. 1 is a perspective view of a digital content player showing the new design;
FIG. 2 is a top plan view of the new design;
FIG. 3 is a bottom plan view of the new design;
FIG. 4 is a front view of the new design;
FIG. 5 is a rear view of the new design;
FIG. 6 is a left side view of the new design;
FIG. 7 is a right side view of the new design; and,
FIG. 8 is a front view of the new design wherein the cylindrical portion of the new design is represented by gray shading to illustrate a transparent part.