Your comment about reusing conceptual frameworks sounds much more like a potential violation of copyright and non-compete agreements than the sort of thing I'm talking about -- showing someone a little piece of code from a database connection factory class or some such. No one would be able to gain significant business value from stealing the sort of isolated samples that interviewees have shown me over the years, but they could certainly benefit from getting a former Amazon employee to reveal the entire inner-workings of their page-generation system.