lemcu.org GPL Exception version 1.0
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As an additional permission, if Lemcusb library is statically linked with one or more of the following 
software libraries, then, these software libraries are not subjected to the TERMS AND CONDITIONS of 
GNU General Public License version 3.0. 

(1) Silicon Laboratories Inc's "emlib", "emdrv", any software supplied as part of application note and/or examples.
(2) ARM Limited's "CMSIS".

They are bound by their own terms and conditions as specified by their authors.