Note GroupDocs.Metadata also works without the license in trial mode with certain limitations Evaluation version limitations You can easily download GroupDocs.Metadata 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. API Limitations Document properties (Pdf, Word, Excel, PowerPoint, Visio, etc) Only first 5 properties can be read XMP API Only first 2 XMP schemes can be read EXIF API GPS IFD and image thumbnail are unavailable Only first 5 properties can be read IPTC API Only first 5 properties can be read Id3v2, Lyrics3, APEv2 tags Only first 5 properties can be read QuickTime atoms Only first 5 atoms can be read File open Open maximum 15 files, otherwise, API throws exception File save Not supported in trial mode Licensing The license file contains details such as the product name, number of developers it is licensed to, subscription expiry date and so on....Signature Product Solution GroupDocs...so on. It contains the digital signature, so don’t modify the file...