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You can use GroupDocs.Comparison without the license. The usage and functionalities are pretty much same as the licensed one but you will face few limitations while using the non-licensed API.

Evaluation Limits

  1. Only up to 3 first pages are processed.
  2. PDF documents: document should not have more then four elements of any collection
  3. Documents with more than 3 pages are not supported.
  4. Only 15 document Comparison per hour.
  5. Trial badges are placed in the document on the top of each page.


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 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.Comparison API if you want to avoid its evaluation limitations. However, license can be loaded from a file or stream object.

Calling License.SetLicense multiple times is not harmful but simply wastes processor time. If you are developing a Windows Forms or console application, call License.SetLicense in your startup code, before using GroupDocs.Comparison classes. 

When developing an ASP.NET application, you can call License.SetLicense from the Global.asax.cs (Global.asax.vb) file in the Application_Start protected method. It is called once when the application starts. Do not call License.SetLicense from within Page_Load methods since it means the license will be loaded every time a web page is loaded.

Default Licensing

You can apply License using license file path or file stream

Metered Licensing

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.

Create metered object and use method SetMeteredKey()

To check current consumption quantity use GetConsumptionQuantity() method

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