Without root access, only the applications can be overridden. The kernel, system libraries, and /mnt/secure hidden items cannot be replaced even if the source code is available. Will the GPG code do any good without the keys? I'm not opposed to getting PB to act on the level with respect to open-sourced code, but I don't see that it will necessarily open the platform to modification if they do. It shouldn't if the Linux system programmers have done their job right.
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