Z:gnu-www-ja-bug-nobody-allowed-to-understand--9b854f-In the 1980s, proprietary soft/en

In the 1980s, proprietary software users discovered the problem of the bug that nobody is allowed to understand. When a problem occurs in the interaction of multiple proprietary software packages with different developers, none of them is allowed to study the source code of all the pertinent programs. As a result, none of them can understand the bad interaction between them, and the bug is never fixed except by accident.