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The LRX format is significantly better protected than for example epub.
Sony has reasonably effective anti-debugging routines in its software, and it uses multithreading and virtual machines (although the use of VMs isn't at the right place, it doesn't improve protection very much) to make reverse engineering from disassembly and debugging more complicated.
Of course all drm is by definition crackable, but the pool of people who can do it for lrx is significantly smaller than for epub.
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