All NX 3.5.0 subscriptions last for a one year period starting from the date of generation of the license keys.

If your subscription has expired, you can decide to renew it in your Customer Area. If you do not renew, you can continue to use the software as it is, but with an expired license. Upgrading your software will fail.

Administrators can check the expiry dates using the following commands:

#/usr/NX/bin/nxserver --subscription

#/usr/NX/bin/nxnode --subscription

Further information is also here on using your software after expiry:

http://www.nomachine.com/AR03D00369