The tag is present in Lintian version 2.104.328. That is the most recent version we know about.
The following source files include material under a non-distributable license from Nvidia. Therefore, it is not even possible to ship this in non-free.
Please re-package the package without the file (if possible) or ask the FTP-masters to remove the package.
If the package has been uploaded to Debian before, please remember to also notify snapshot.debian.org about this package containing a non-distributable file.
Please refer to https://bugs.debian.org/724930#27 for details.