How Synology camera licenses work

I am confused about licenses for surveillance cameras vs the number of cameras the devise supports. To be clear, I have a Synology DS216j and it supports 10 IP cameras and has 2 licenses. What does that mean? Does it mean I can only run 2 cameras total? Does it mean I can run 10 cameras with one license? Or does it mean I need 1 license for 5 cameras? Also, the Total FPS (H.264)* is confusing. this is what is listed for my device:

300 FPS @ 720p (1280×720)
150 FPS @ 1080p (1920×1080)
100 FPS @ 3M (2048×1536)
40 FPS @ 5M (2591×1944)

So it looks like if I run 10 cameras at 30 frames per second, my device can only handle 10 cameras for 720p. However, if I want a better quality camera (like 1080p) I can only theoretically have 5 cameras of such quality?

Originally Synology offers 2 free licenses. This will let you add 2 cameras to the surveillance software they offer. If you want to add more cameras and be able to record from all of them- you need to purchase a license covering extra 1 or 4 or 8 cameras.

And it is correct – if you want to record at resolution 1080p, you NAS will only cop with 5 cameras. Maximum 216j can do is 150 frames per second on this resolution. Standard framerate for all videos is around 30 frames per second or less. So 150 : 30 = 5 recording streams. you can reduce the frame rate to a lower number, as it is not necessary to have that many frames for surveillance footage. You can also save some space by selecting an only specific area of the camera covered angle to be recorded.

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