Red Hat's "obfuscated" kernel source

One major point that was raised against it was the inability to check if the git tree is distributable. When a package enters Debian the source tarball does get checked if the license allows them to distribute it (and for main if it complies to the DFSG). That's currently file-based. Now, with bad luck, you could have non-compliant files buried deep in the git tree; with potentially undistributable files among them, that have since been stripped from the exported tarball. Getting a solution to this problem would help the format's adoption greatly.