Last Modified October 2, 2026
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TurnKey Activation - De-Activate the License

 

To allow your Users to install the application on a different computer, the License needs to be de-activated on the current computer.

Typically, you would provide a menu item in your software application that allows the de-activation of the software.

The DNA_ProtectionOK() Option 3 with built-in De-Activation function will perform the following:

  • present a built-in screen for capturing the License Password from the User TurnKey De-Activation Screen
  • call DNA_DeActivate()
  • disable the CDM license file on the User’s computer
  • instruct the DNA Server to free-up (i.e. delete) the "Computer" or the "Seat" for this computer which can then be used by another computer / user.

For Floating Licenses, you would include a DNA_Deactivate call in the "Close" event handler of your Application.
See Using the TurnKey Activation Process with Floating Licenses     for details.

De-Activate the License

Highlighted lines indicate where additional code is required or needs to be modified.

                	
                        //************** De-Activation code **********************//
                            
                        //
                        // For de-activation of the License to allow the User to install on another
                        // computer, the following code should be included
                        // in the response to a "De-Activate" button click or menu selection 
                        //
                        
                        errNo = DNA_ProtectionOK(DNA_product_key,3,0);
                        
                        if (errNo == 0)
                        
                            {
                                // deactivation was OK, exit the application
                                
                            }
                        else
                        	{
                                // error occurred, quit the application
                        
                                // optionally, you can display an error message
                                // you can use DNA_ERROR() which translate the errNo into a more
                                // user-friendly description, or use your own descriptions
                        
                                DNA_Error(errNo,buffer,sizeof(buffer));
                        
                                // display error explanation
                                // quit the application
                                
                        	}