Simply put, the GPL says that anyone who redistributes the software, with or without changes, must pass along the freedom to further copy and change it. By distributing the complete source code for GNU ALS under the terms of the GPL, we guarantee that you and all other users will have the freedom to redistribute and change ALS.
Releasing the source code for ALS has another benefit as well. By having access to all of the source code for estimation software like ALS, you have the ability to see exactly how each and every computation is performed. There are no black boxes that hide the details of any calculation.
Although enhancements to ALS that are written as function files in Octave's scripting language are not required to be redistributed under the terms of the GPL, we encourage you to release your enhancements to ALS under the same terms for the benefit of all users. We also encourage you to submit your changes for inclusion in future versions of ALS.
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Copyright (C) 2008 Fernando V. Lima. Verbatim copying and distribution is permitted in any medium, provided this notice is preserved.
University of Wisconsin
Department of Chemical Engineering
Madison WI 53719