The ornamental design for a protectivenet, as shown and described.
FIG. 1 is a front-right-top perspective view of a protective net showing our new design;
FIG. 2 is a rear-left-top perspective view thereof;
FIG. 3 is a front view thereof;
FIG. 4 is a rear view thereof;
FIG. 5 is a left side view thereof; and,
FIG. 6 is a right side view thereof.
The broken lines shown herein are for the purpose of illustrating portions of the protective net and an exemplary trampoline environment for the protective net, the broken lines forming no part of the claimed design.