Delivering source code with your software

A fairly old Joel on software column:

Until yesterday, the FogBUGZ license said that you couldn't reverse engineer the program, attempt to look at the source code, or modify it in any way. Various honest people have asked how much we charge for a source license, so that they could customize a few things.

Hmmm. Why does the license say you can't change the source code? I couldn't think of a single reason. In fact I thought of a lot of counter-reasons, and immediately changed the license agreement. So now you're going to have to sit through one of those old-fuddy-duddy stories from my past.