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Re:Norwegian backup provider promises NSA-free data storage ... by sigil on Monday June 17, 2013 @10:12AM (#5893223)
> Redistribution and use...without modification, is permitted for the sole purpose of using the "tarsnap" service.

(emphasis mine) This sounds like there are no restrictions on distributing modified source / binaries.

Re:Norwegian backup provider promises NSA-free data storage ... by cperciva on Monday June 17, 2013 @04:55PM (#5895889)
Quite the opposite: No permission is given to distribute modified versions, so you're not allowed to do it.