What is the difference between LIC-SX20-PR vs LIC-SX20-HD
Without the zero-cost LIC-SX20-HD option key, the highest resolution the SX20 will support is 1024x576@30fps. With it, you can use 1280x720@30fps. With the PR option key, you can use 1920x1080@30fps or 1280x720@60fps.
I think when they designed the SX20 (and it's predecessor the C20) they were going to charge a license fee for the HD option, but then later changes their minds and made it a zero cost option, but the software design still required it be in place.
I believe the HD key is a prerequisite for the PR key, and the PR key does nothing without the HD key already installed, but I'm not sure of that.
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