Evaluation Limitations You can easily download GroupDocs.Classification for evaluation. The evaluation download is the same as the purchased download. The evaluation version simply becomes licensed when you add a few lines of code to apply the license. You will face following limitations while using the API without the license: Texts with more than 200 characters are not supported. Documents with more than 200 characters are not supported. For the sentiment classification this limitations are 100 for English and 30 Chinese....Signature Product Solution GroupDocs... It contains the digital signature, so don’t modify the file...