[rbanffy]

> anyone can freely make use of BSD licensed code, as they see fit.

Anyone but the users of "improved" versions.

[stephenr]

So you're working on the assumption that Fred took some of my BSD code, improved it, released it as a product, and Bob has paid for a commercial license to use it. Now Bob says he wants the source code for Fred's product.

How is it my right or the right of the user to demand what Fred do with the code he wrote?