Open source is, specifically, a software term. Not everything that is copyleft is open source. Graphics, for instance, can be royalty free, or released with a creative commons license, but that doesn't make them open source.
Open source is, specifically, a software term. Not everything that is copyleft is open source. Graphics, for instance, can be royalty free, or released with a creative commons license, but that doesn't make them open source.
RE: Wallpapers on software design principles