The project license has an exception, which you have put into the Comment: field in d/copyright, putting just "Apache-2" into the License field. This is incorrect, as the project license is not "Apache-2". The Comment: is not meant to contains parts of the license. You should also look at the "GPL-2+ with OpenSSL exception" example in the section 7.2 of the spec.
-- WBR, wRAR
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