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https://github.com/spdx/spdx-spec/issues/93

Add false "isFsfLibre" value


https://github.com/spdx/spdx-spec/issues/46#issuecomment-413778513

In reviewing https://www.gnu.org/licenses/license-list.html, the FSF specifies "Free and Compatible with GPL", "Free and Incompatible with GPL" and "non-free". Do we need to capture all of these states? If so, do we want a second boolean ("FsfGplCompatible")? We could always implement a second boolean in the future.

The Code for the left border at https://www.gnu.org/licenses/license-list.html defines five properties:

    Free licenses, compatible with the GNU GPL
    Free licenses, compatible with the FDL
    Free licenses, incompatible with the GNU GPL and FDL
    Nonfree licenses
    Licenses for works stating a viewpoint