Z:gnu-www-ja-second-sight--01ce90-Even worse, they impose frustr/en

Even worse, they impose frustrating restrictions on the users, denying them access to the software's source code, the plans that a programmer can read and understand and change. All the users get is an executable, a &ldquo;black box&rdquo;, so that they cannot adapt it, understand it or even verify what it does.