If a license needs to be removed from a system or the access to the license needs to be disabled, the steps are different for the different license types:

Important: before removing a license from a system or disabling access to a license, take to following points into consideration:

• Make sure that there is a valid replacement license for all emulator instances depending on the license to be removed, or make sure the emulated systems have been cleanly shut down,
• Make sure that this step will not negatively impact your production environment.

Removing a Hardware License from a System

To remove a hardware license from a system, simply unplug it from the system.

Removing a Software License from a System

Please note:

The old method for removing a software license from a system depended on the license transfer functionality. This functionality is no longer available in the current versions of the Charon products. The only way to remove a non-transferable obsolete software license is the method described below. On Microsoft Windows, you can use the Charon License Utility (see CHARON on Windows - Charon License Utility) to perform the necessary steps.

To remove an obsolete software license or a software license in cloned state (a software license goes into a cloned state, for example, if a VM is cloned to a different Virtual Machine UUID) from the system, perform the following basic steps:

• Start the Sentinel Admin Control Center (ACC) (for local system: URL http://localhost:1947).
• Identify the software license that is to be removed.
• Identify the name of the certificate file(s) and the path of the base directory where they are stored.
• Remove the certificate file(s).
• Restart the Sentinel runtime service.

The following example shows the required steps in detail:

1. Go to http://localhost:1947/ to access the Sentinel HASP ACC and select Sentinel Keys on the left.

2. In the Sentinel Admin Control Center (ACC), go to Sentinel Keys and locate the target "Sentinel SL AdminMode" license to be removed.

3. Click on the Certificates button at the right side of the SL description: 

Old version (showing a software license in cloned state):

New version (showing an active software license and a cloned software license):

4. Note the name of the corresponding certificate file(s) and the path to the certificates base directory as shown in the "Certificates" section:

Example using old ACC version:

Please note: the certificate display screen can look slightly different depending on the type of software license and the actions performed on this license in the past.
The following example shows the certificates of a software license after several updates. The screenshot is based on Sentinel ACC version equal or higher than version 7.60.

5. Remove the certificate file(s) using operating system tools.

a. In the first example above (Windows), there is one file to be removed. It is in C:\Program Files (x86)\Common Files\SafeNet Sentinel\Sentinel LDK\installed\68704. 
b. In the second example (Linux) there are several files created by a series of license updates. On Linux, the certificate files are typically stored in /var/hasplm/installed/68704/.
c. All certificate files in the identified directory must be removed.

6. After removing the certificate file, restart the Sentinel license service or reboot the system. To restart the service, proceed as follows:

a. On Windows, restart the "Sentinel LDK License Manager" service (hasplms) either using the services.msc program or via a command line (as administrator) then enter the "sc stop hasplms" command followed by "sc start hasplms".
Important: any running emulators will be stopped if the license service is forced to stop despite existing service dependencies (i.e., running emulators). So any running guest systems must be cleanly shutdown before restarting the license service in order to avoid data loss.

b. On Red Hat Enterprise Linux 7.x and higher (and compatible Linux systems) restart the aksusbd service: # systemctl restart aksusbd
This also will automatically restart the hasplmd service (separate service for this daemon was introduced in newer runtime driver versions).

c. On Red Hat Enterprise Linux 6.x, restart the aksusbd service: # service aksusbd restart

7. Start the Sentinel ACC again to verify that the software license has been removed.

Removing Access to Network Licenses from a System

There are three different ways to remove a network license. They have different implications and are described below:

Full Removal of Network License

To completely remove a network license, follow the steps above for hardware or software licenses respectively. The steps must be performed on the license server.

Please note: this will remove the license for all emulator hosts on the network using this license and also for the local host. Make sure that this is in fact intended.

Block Access of Remote Emulator Hosts to Network License

You can use the Sentinel Admin Control Center on the license server

• to allow access to a network license for all or specific hosts on the network, or
• to block access from remote hosts completely.

Please refer to the section Controlling Access to Network License on Server Side in Tasks Specific to Network Licenses for more information.

Block Access to Network Licenses on Client System

If access of the local system to network licenses is not desired, this can be disabled in the Sentinel ACC for certain products and product versions. Blocking access at the server side is the safer way.

Please refer to the section Controlling Access to Network License on Client Side in Tasks Specific to Network Licenses for more information.