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Update README.md

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@@ -4,3 +4,5 @@ configs:
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  data_files: "combined.json"
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  license: cc0-1.0
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  ---
 
 
 
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  data_files: "combined.json"
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  license: cc0-1.0
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  ---
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+ The `oreg` and the `odat` refer to the original registration number and date respectively of the copyright entry and thats what we try to match with the Copyright Catalog. `rdat` is the renewal date. The other columns are pretty self-explanatory.