rename files to have CC- præfix (or CC0)
-rw-r--r-- 18650 CC-BY-NC-ND_3.0.txt
-rw-r--r-- 18994 CC-BY-NC-ND_4.0.txt
-rw-r--r-- 22309 CC-BY-NC-SA_3.0.txt
-rw-r--r-- 20717 CC-BY-NC-SA_4.0.txt
-rw-r--r-- 20479 CC-BY-NC_3.0.txt
-rw-r--r-- 19214 CC-BY-NC_4.0.txt
-rw-r--r-- 17650 CC-BY-ND_3.0.txt
-rw-r--r-- 18304 CC-BY-ND_4.0.txt
-rw-r--r-- 22240 CC-BY-SA_3.0.txt
-rw-r--r-- 20005 CC-BY-SA_4.0.txt
-rw-r--r-- 19467 CC-BY_3.0.txt
-rw-r--r-- 18524 CC-BY_4.0.txt
-rw-r--r-- 7048 CC0_1.0.txt