Concurrent Licences

This is a new licensing model to deal with environments such as AWS where the hosted servers where they constantly change their machine ID (which is tied to the licence) and as a result the licence activated becomes invalid; which has becomes a problem for developers to re-activate the licence on their customers’ system.

To try to avoid such nightmare and reduce the amount of admin and paper work, we have set up a new way of how licence and licence activation is controlled and invoiced.

To start with, you will be given a special concurrent licence key “XXXX-YYYY-ZZZZ”. This licence key will allow upto N concurrent systems to obtain licenses from our online licence server. The licence will be held in system memory so if the application is shut down or the machine is shut down it will lose the licence and a new one will need to be obtained before any of the DicomObjects functions are called.

The licence key will also control how long a licence is valid for.

Both the maximum number of concurrent licenses and the validity of the licence shall be agreed between you and us before the licence key is issued.

And to implement the concurrent licence is straighforward:

DicomObjects.NET

Application Start-up

// set up the event that fires before the DicomLicense expires
DicomLicense.LicenseExpirationEvent += DicomLicense_LicenseExpirationEvent;

// if no licence found, get a concurrent licence
if (DicomLicense.CurrentLicense == null)
{
	string result;
	DicomLicense l = DicomLicense.GetRamLicense("XXXX-YYYY-ZZZZ", "Customer Info", out result);
}

Application Shut-down

// delete the concurrent licence on application exit
// also releases it back to the licence server, so someone else could get a concurrent licence
DicomLicense.RemoveRamLicense();

On License Expiring

private void DicomLicense_LicenseExpirationEvent(TimeSpan remaining)
{            
	string result;
	// Renew the Concurrent License
	DicomLicense l = DicomLicense.GetRamLicense("XXXX-YYYY-ZZZZ", "Customer Info", out result);
}

So it’s fairly straightforward to set it up in user code and not difficult to understand the logic.

For instance:

Note, without anything else, the concurrent licensing model requires all systems to have internet access to talk to our online licence server.

For offline machines, we can help you build your internal concurrent licence server that will act as a router between the offline machiens and our online licence server.


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