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YEAFFT (YEt Another Fast Fourier Transform) is licensed under GPL (See GPL license.) Glucas is a part of code using YEAFFT, which makes primality tests of Mersenne numbers. This code is related to user interface and Lucas-Lehmer specific code. It can be considered as free code, because it includes code and ideas from many other authors and we honestly are not the owners. Once said that, almost all this code is from the YEAFFT authors (See Contributors.)
What follows is referred to YEAFFT library. To see what part of code belongs to this license see the source code. At the top of every file in the package you will see the license GPL (if any). (See GPL license.)