Some specific camera models do not count against your license quota, effectively allowing you to add more cameras for "free":
For many home users who simply want to monitor a front door and a backyard, these two included licenses are completely free and sufficient. You do not need to buy anything extra to use these. synology surveillance station license free free
Sometimes the answer to "How do I get Synology licenses for free?" is "Stop using Synology." Some specific camera models do not count against
The DVA series is actually cheaper if you need high-end AI (Deep learning motion detection) + 8 cameras. synology surveillance station license free free