For some software, this is about as open as it can get. Specifically, if you're writing code in the U.S. and include certain algorithms, your code falls under the Commerce Department's export regulations. If you don't qualify for the "Unrestricted" license exception, you might have to keep track of exactly who is getting copies of your code and ensuring that nobody from certain nations is. I believe this situation would impact any company developing what would otherwise be open source software according to the accepted definition, but I'm not positive. Fortunately, I've only ever had to worry about software arising from academic research.
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