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Excellent legal piece explaining the options and methods of how software programs use licensed and copyrighted third party libraries through an API. Finally, some clear thinking about Google Android and the Oracle Java Law Suit.
excerpt: Another option for a developer is to do what Google did when it created Android, and create replacement code libraries that are compatible with the existing code libraries, but which are new copyrighted works. Being "compatible" in this context means that the new libraries are called in the same way that the old libraries are--that is, using the same APIs. But the actual copyrighted code that is being called is a new work. As long as the new developer didn't actually copy code from the original libraries, the new libraries are not infringing. It does not infringe on the copyright of a piece of software to create a new piece of software that works the same way; copyright protects the actual expression (lines of code) but not the functionality of a program. The functionality of a program is protected by patent, or not at all.
In the Oracle/Google case, no one is arguing that code libraries themselves are not copyrightable. Of course they are and this is why the Google/Oracle dispute has no bearing on the enforceability of the GPL. Instead, the argument is about whether the method of using a code library, the APIs, is subject to a copyright that is independent of the copyright of the code itself. If the argument that APIs are not copyrightable prevails, programs that are created by statically-linking GPL'd code libraries will still be considered derivative works of the code libraries and will still have to be released under the GPL.
Though irrelevant to the enforceability of the GPL, the Oracle/Google dispute is still interesting. Oracle is claiming that Google, by creating compatible, replacement code libraries that are "called" in the same way as Oracle's code libraries (that is, using the same APIs), infringed

Ext JS, said Mullany, includes numerous UI elements and handlers that are built entirely from CSS 3, HTML5 and JavaScript. As a result, the applications built with Ext JS can be run on any WebKit-based browser. Both Android and the iPhone use WebKit-based browsers, and RIM should soon offer one as well for BlackBerry users. Mullany said each interface element is built on top of CSS, and can therefore be skinned and modified by designers after creation. He also said this limits the size of the code that must be embedded in each page with Ext JS elements. Ext JS is available for free under the GPL. For commercial users, the software will cost US$1,000 per developer per year.

Notepad++ is a free (as in "free speech" and also as in "free beer") source code editor and Notepad replacement that supports several languages. Running in the MS Windows environment, its use is governed by GPL License. Excellent recommendation from Marbux!  Very powerful but easy to use OSS Based on the powerful editing component Scintilla, Notepad++ is written in C++ and uses pure Win32 API and STL which ensures a higher execution speed and smaller program size. By optimizing as many routines as possible without losing user friendliness, Notepad++ is trying to reduce the world carbon dioxide emissions. When using less CPU power, the PC can throttle down and reduce power consumption, resulting in a greener environment.

Modernizr is a small and simple JavaScript library that helps you take advantage of emerging web technologies (CSS3, HTML 5) while still maintaining a fine level of control over older browsers that may not yet support these new technologies. Modernizr uses feature detection to test the current browser against upcoming features like rgba(), border-radius, CSS Transitions and many more. These are currently being implemented across browsers and with Modernizr you can start using them right now, with an easy way to control the fallbacks for browsers that don't yet support them. Additionally, Modernizr creates a self-titled global JavaScript object which contains properties for each feature; if a browser supports it, the property will evaluate true and if not, it will be false. Lastly, Modernizr also adds support for styling and printing HTML5 elements. This allows you to use more semantic, forward-looking elements such as , and without having to worry about them not working in Internet Explorer. Another great catch by Marbux!  He's on fire today.

[Blush.] Should be mentioned that Modernizr comes with an MIT-BSD dual license. So compatible with both GPL and proprietary apps.

Excellent discussion that covers the full spectrum of Open Source Software - Community licenses.