Protective cover

The design consists of the features of shape and configuration of the protective cover shown in the drawings. The broken lines in each figure are for illustrative purposes only and form no part of the claimed design.Fig. 1 is a front perspective view of a protective cover of the present design, showing environment;Fig. 2 is a front elevational view of the protective cover of Fig. 1;Fig. 3 is a rear elevational view of the protective cover of Fig. 1;Fig. 4 is a left side elevational view of the protective cover of Fig. 1;Fig. 5 is a right side elevational view of the protective cover of Fig. 1;Fig. 6 is a top plan view of the protective cover of Fig. 1; andFig. 7 is a bottom plan view of the protective cover of Fig. 1,