We told you about the Motorola Atrix 4G getting the system dump root treatment, and although it seemed like a tedious task to get going, it appears that to the disappointment of many developers, Motorola still has things fairly locked down once you get to see the different partitions.
It appears that the system dump is not encrypted, but the whole partition is signed by Motorola, meaning that the files in the root cannot be replaced by custom files like recovery. Basically, some files are still locked as a result, making the rooting only partially successful, and pretty much useless for now.
More information can be found at this thread.
[via XDA-Developers]