Evaluation Limitations and Licensing

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.  

Document properties (Pdf, Word, Excel, PowerPoint, Visio, etc)Only first 5 properties can be read
XMP APIOnly first 2 XMP schemes can be read
EXIF APIGPS IFD and image thumbnail are unavailable
Only first 5 properties can be read
IPTC APIOnly first 5 properties can be read
Id3v2, Lyrics3, APEv2 tagsOnly first 5 properties can be read
QuickTime atomsOnly first 5 atoms can be read
File openOpen maximum 15 files, otherwise, API throws exception
File saveNot supported in trial mode


The license file contains details such as the product name, number of developers it is licensed to, subscription expiry date and so on. It contains the digital signature, so don’t modify the file. Even inadvertent addition of an extra line break into the file will invalidate it. You need to set a license before utilizing GroupDocs.Metadata API if you want to avoid its evaluation limitations. 

The license can be loaded from a file or stream object.

Applying license from file

The code below will explain how to apply a  product license.

// initialize License
License lic = new License();

// apply license

Applying license from stream

The following example shows how to load a license from a stream.

try (InputStream stream = new FileInputStream("D:\\GroupDocs.Metadata.lic")) {
	License license = new License();
Calling License.setLicense multiple times is not harmful but simply wastes processor time. It is called once when the application starts.

Applying Metered license

You can also set Metered license as an alternative to license file. It is a new licensing mechanism that will be used along with existing licensing method. It is useful for the customers who want to be billed based on the usage of the API features. For more details, please refer to Metered Licensing FAQ section.

Here are the simple steps to use the Metered class.

  1. Create an instance of Metered class.
  2. Pass public & private keys to [setMeteredKey](https://reference.groupdocs.com/metadata/java/com.groupdocs.metadata.licensing/Metered#setMeteredKey(java.lang.String,%20java.lang.String)) method.
  3. Do processing (perform task).
  4. call method [getConsumptionQuantity](https://reference.groupdocs.com/metadata/java/com.groupdocs.metadata.licensing/Metered#getConsumptionQuantity()) of the Metered class.
  5. It will return the amount/quantity of API requests that you have consumed so far.
  6. call method [getConsumptionCredit](https://reference.groupdocs.com/metadata/java/com.groupdocs.metadata.licensing/Metered#getConsumptionCredit()) of the Metered class (Since version 19.5).
  7. It will return the credit that you have consumed so far.

Following is the sample code demonstrating how to use Metered class.

// initialize Metered API
Metered metered = new Metered();

// set-up credentials
metered.setMeteredKey("publicKey", "privateKey");