We are starting to sell the Unlimited Playback License now, it supported by QVR Pro 1.2.1.
How to buy:
Go to https://license.qnap.com/#/license_product?pid=14
Below is the whole license comparison table

Important info of license:
*1. From QVR Pro 1.2.1.0, channel license installation will not be limited by QVR Pro Gold.
>> So user could buy channel license directly. But it will still be limited by 14 days playback limitation.
*2. Without QVR Pro Gold, you can still access all previous recordings via File Station.
*3. QVR Center itself is a free application that does not require licenses. By default, QVR Center can manage up to 2 QVR Pro servers without activating licenses.
Note: Starting from QVR Center 1.1, you can also manage Surveillance Station & QVR 5.1.x in QVR Center. (Including Live & Playback)
*4. Every NAS could only install single QVR Pro Gold or single QVR Pro Unlimited Playback.
*5. Every license can only be used on one QNAP NAS and is not transferable.