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What does this protect against, what are it's features?
This type of security is primarily concerned with off-line storage security. It does not replace permissions.
It allows for more secure backup methods.
It allows for all data written to the disks of a system to be encrypted. This includes memory swapped to disk.
Once the disk is mounted, it's transparently encrypted and decrypted on the fly. Thus it's native and doesn't require that you rewrite your applications to take advantage of it.
It allows for entirely encrypted disk protection depending on how you boot your system.
It allows for individual partitions (or files) to be encrypted on a per user (revocable) basis.
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