↑Graham, Lawrence D (1999). Legal battles that shaped the computer industry. Greenwood Publishing Group. p. 175. ISBN 978-1-56720-178-9. Retrieved 2009-03-16. "Freeware, however, is generally only free in terms of price; the author typically retains all other rights, including the rights to copy, distribute, and make derivative works from the software."
↑5,05,1Open-source software is not always freeware (May 16, 2010)Pukyumanta willaypi pantasqa: Etiqueta<ref> no válida; el nombre «wolfire2010» está definido varias veces con contenidos diferentes
↑A tale of two pricing systems for services. 2012.
