The source was available, but with cryptic variable names and (apparently) no or little comments:

> Ward mentioned that the biggest bottleneck was the cryptic variable names—short abbreviations that were common in old-school programming but made the code nearly impossible to follow.

> "He not only commented everything," Ward marveled, "he went through every single line of code and renamed every single variable for me in about three days.

I think it's still fair to use the term "reverse engineering".