All reports of license-problem-convert-utf-code for the archive. The extended description of this tag is:
The following file source files include material under a non-free license from Unicode Inc. Therefore, it is not possible to ship this in main or contrib.
This license does not grant any permission to modify the files (thus failing DFSG#3). Moreover, the license grant seems to attempt to restrict use to "products supporting the Unicode Standard" (thus failing DFSG#6).
In this case a solution is to use libicu and to remove this code by repacking.
If this is a false-positive, please report a bug against Lintian.
Refer to https://bugs.debian.org/823100 for details.
This tag has not been emitted in any package tested by Lintian.