Teensy with copy protection question

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Hey, what’s the difference between this one with copy protection and the other Teensy 4.0?

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Here is what sparkfun says for the lockable unit:

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Here is what PJRC says about the differences:

Code Security & Lockable Teensy

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Ah, so it’s like if you want to protect your code, you trip that fuse and nobody can read your firmware off it. But once you do it there’s no updating it. I definitely don’t want that.

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Actually I see that I have that only partially correct. It can be upgraded but you have to have the encryption key to do it.

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