what is difference between these two roms
RUU_Leo_HTC_WWE_1.66.405.2_Radio_15.32.50.07U_2.07.51.22_2_Signed_LEO_Ship
&
RUU_Leo_HTC_WWE_1.66.405.2_Radio_CRC_Signed_15.32.50.07U_2.07.51.22_2_Ship
both are official roms but what is meant by crc signed
RUU_Leo_HTC_WWE_1.66.405.2_Radio_15.32.50.07U_2.07.51.22_2_Signed_LEO_Ship
&
RUU_Leo_HTC_WWE_1.66.405.2_Radio_CRC_Signed_15.32.50.07U_2.07.51.22_2_Ship
both are official roms but what is meant by crc signed