No commercial usage clause

Description

A clause published alongside a copyright notice, usually in lieu of a full license, with the text simply stating that "you are allowed to use the software in a personal setting but it may only be used commercially with a full license from the author" or words to that effect. This was and is primarily used in cases where a full un-crippled version of software (typically shareware) or full source code is included with a software package that is otherwise meant to be demonstration copy or a marketing device.

In the more recent years it has become more common for people to offer two different licenses and price structures on software products according to their intended use, with open source authors in particular barring the use of their products in any commercial situation although the alternative of barring the change of the source code in that situation works as well in most cases. But even bigger commercial vendors have started doing the same, the "Home and Student" versions of Microsoft Office display prominently a "No commercial usage allowed" on their applications task-bar and some vendors have different usage terms according to its final use, for instance Ability Office cost the same for private or business use, but private users may install the package on five different machine while commercial users are only allowed to install on two.