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PianoCheater is FREEware.
...and some (EVEN MORE) boring stuff follows...
The term freeware was coined and trademarked in the 1980s by Andrew Fluegelman, an attorney, computer magazine editor and developer of a popular communications program named PC-Talk. However, that trademark was subsequently abandoned and the term thus became generic ( i.e., it can legally be used by anybody).
Freeware is very different from free software. The latter term generally refers to software that is free not only in a monetary sense but also in that there are no restrictions (or only very minimal restrictions) on its use, including the rights to modify it and redistribute the modified forms.
Freeware is also different from open source software. The latter term refers to software for which the source code is made freely available and for which there are very minimal restrictions on its use. Open source software is usually also free in a monetary sense, and thus in most cases is the same thing as free software.
There are several additional categories of software that are also available (at least to some extent) at no cost to users, but which are not necessarily freeware.
Among them is shareware, which is distributed in a manner similar to freeware except that it typically requires payment after some trial period or for the activation of some features. As is the case with most freeware, the source code is usually not available. Nagware is a type of shareware that periodically reminds the user to register (and pay for) the program, typically in the form of dialog boxes (i.e., pop-up messages) that appear on the screen either when the program is starting up or while it is being used.
Public domain software is software that is in the public domain, that is, the copyright has been explicitly relinquished by its owner (usually the developer) and thus nobody owns it. Anybody is entitled to use such software for any purpose, including modifying it, giving it away and selling it in its original or modified form. Most freeware, however, is not in the public domain, as the owner has not relinquished the copyright.