Illegal Prime Numbers
[ Ignoring the morality of making ideas illegal... ]<p>This demonstrates the difference between data (i.e. the number itself) and information (the interpretation of data and use cases derived from that interpretation).<p>What is "illegal" here is certain kinds of encryption and security software. A prime number is not the same thing as encryption and security software. But you can specify processes which allow encryption and security software to be uniquely identified by a prime number. The interpretation <i>combined</i> with the data is what's important, not the data in isolation.