TweakScale is double licensed as follows: SKL 1.0: You are free to: Use : unpack and use the material in any computer or device Redistribute : redistribute the original package in any medium Under the following terms: You agree to use the material only on (or to) KSP You don’t alter the package in any form or way (but you can embedded it) You don’t change the material in any way, and retain any copyright notices You must explicitly state the author’s Copyright, as well an Official Site for downloading the original and new versions (the one you used to download is good enough) GPL 2.0: You are free to: Use : unpack and use the material in any computer or device Redistribute : redistribute the original package in any medium Adapt : Reuse, modify or incorporate source code into your works (and redistribute it!) Under the following terms: You retain any copyright notices You recognize and respect any trademarks You don’t impersonate the authors, neither redistribute a derivative that could be misrepresented as theirs. You credit the author and republish the copyright notices on your works where the code is used. You relicense (and fully comply) your works using GPL 2.0 (or later) You don’t mix your work with GPL incompatible works. You are allowed to choose the License that better suits you. If by some reason the GPL would be invalid for you, rest assured that you still retain the right to Use the Work under SKL 1.0.