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Where in the document does it actually grant you copyright license to the source code or other IP in question? The only language that's close to a grant of license is: "Everyone is permitted to copy and distribute verbatim or modified copies of this license document, and changing it is allowed as long as the name is changed." Notice nowhere in the WTFPL is the source code, documentation or any other IP other than the license itself actually mentioned. Compare this to the grant in the MIT license: "Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:" Of course you could argue "well, everyone knows that it's MEANT to grant license to the source code if you put it in a LICENSE file" but in my experience, lawyers encountering the WTFPL have pretty strongly disagreed with that stance. |
https://en.wikipedia.org/wiki/WTFPL