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You can use GroupDocs.Search 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 Version Limitations

You can easily download GroupDocs.Search 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.  

Indexing Limitations

Following are the indexing limitations user will face while using the trial version of the GroupDocs.Search API:

  • Total count of indexed documents in one index or in several indices for index repository cannot exceed 100 files
  • Indexing stops when count of indexed documents in an index or in all indices in index repository becomes 100
  • All changed files can be updated in an index during Update
  • New files can only be added to an index during update if total count of indexed documents is less than 100

Searching Limitations

Only first 10 results returned in search results.

Licensing 

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.Search API if you want to avoid its evaluation limitations. 

The license can be loaded from a file or stream object. The easiest way to set a license is to put the license file in the same folder as the GroupDocs.Search.dll file and specify the file name, without a path, as shown in the examples below.

Applying License from File

The code below will explain how to apply product license.

Applying License from Stream

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

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.Search 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.

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.

Following is the sample code demonstrating how to set metered public and private keys.

 
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