By the way, is it right to call these free sets "open-source". From the GPL:

> The "source code" for a work means the preferred form of the work for making modifications to it.

Unless the designers from Streamline are working directly with the SVGs, which is possible, but unlikely. To be truly open-source, it would have to include, for example, Illustrator files.

Otherwise, it is free, libre, permissive or just open. But I wouldn't call it open source unless we have the source.