Update README.md

README.md

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 ---
-license: unlicense
 task_categories:
 - image-classification
 language:
@@ -17,4 +16,15 @@ size_categories:
 
 This dataset is adapted from [CASIA Online and Offline Chinese Handwriting Databases](https://nlpr.ia.ac.cn/databases/handwriting/Download.html),
 but this only contains character level sample data (from the offline database). The first column is the ground truth label (single character from
-GB2312 charset) and the second one is byte sequences of the decoded **PNG** files from the original [.gnt](https://nlpr.ia.ac.cn/databases/Download/DGRLRead.cpp.pdf) files.
+GB2312 charset) and the second one is byte sequences of the decoded **PNG** files from the original [.gnt](https://nlpr.ia.ac.cn/databases/Download/DGRLRead.cpp.pdf) files.
+
+# Conditions of Academic Use
+Please refer to [the official page](https://nlpr.ia.ac.cn/databases/handwriting/Application_form.html) for more information.
+
+All samples in the databases under this agreement can only be used by the group of the named applicant and can only be used for research purpose. No samples can be used for 
+any commercial purpose.
+
+The Institute of Automation of CAS retains the copyright of all sample data in the databases.
+
+Publications of research results on the database should be appropriately acknowledged. The recommended reference is below:
+> C.-L. Liu, F. Yin, D.-H. Wang, Q.-F. Wang, CASIA online and offline Chinese handwriting databases, Proc. 11th International Conference on Document Analysis and Recognition (ICDAR), Beijing, China, 2011, pp.37-41.