YO!!! YOU DO NO NEED TO CLEAR DRUM SAMPLES AS THEY ARE TOO SMALL AND TOO HARD TO PROVE,you dont even have to clear sound samples if you chop them up and create your own melodies.its if you take a loop or a melody and its recognizable. IF i were you i would'nt go clearing samples unless youre releasing the track,and the record label that releases your track would arrange that for you or at least advize you.
peace,OPUS