More link: https://www.behance.net/gallery/15679669/Kalopsia-Slab-(FREE-Type-Face)
This fonts are authors' property, and are either shareware, demo versions or public domain. The licence mentioned above the download button is just an indication. Please look at the readme-files in the archives or check the indicated author's website for details, and contact him if in doubt. If no author/licence is indicated that's because we don't have information, that doesn't mean it's free.
Personal BETA copy of Kalopsia Slab, enjoy!
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