/usr/share/lintian/overrides/libnss3-dev is in libnss3-dev 2:3.14.5-1+deb7u5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | # License says GPL 2 or subsequent, so pointing to the latest version is fine
libnss3-dev: copyright-refers-to-versionless-license-file usr/share/common-licenses/GPL
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