There's no basis in policy for trying to push DEP-5 format on people. If people want to spend their time on converting perfectly adequate copyright files into a new complex format that has more rules and is less readable, they are welcome to, but it's not appropriate to use Lintian as a vehicle to push it on the rest of us (if you want to use a Debian package to push Debian developers to do things your way regardless, dpkg is the package you want to help maintain).
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