範囲取り込み品質 100.0 %でNo matchとはどういうこと？

Track | CTDB Status
1 | (1/1) Accurately ripped
2 | (1/1) Accurately ripped
3 | (1/1) Accurately ripped
4 | (1/1) Accurately ripped
5 | (1/1) Accurately ripped
6 | (0/1) No match
7 | (1/1) Accurately ripped
8 | (1/1) Accurately ripped
9 | (1/1) Accurately ripped
10 | (1/1) Accurately ripped
11 | (1/1) Accurately ripped
12 | (1/1) Accurately ripped