licenserecon's reporting GPL-3 vs GPL-3+ as a difference
is not a misleading false positive. They are different licenses.
The latter confers the right to use a later license, the former does not.

kitty's d/copyright file should have a separate file stanza for the
GPL-3 (only) files.
See https://ftp-master.debian.org/licenses/good/gpl3/
In the box to the right it says;
  [Be careful to reflect the right restriction, ie. "version 3 only" or "version 3 or any later".]

Anyway, as you prefer not to see these GPL version differences,
I'm changing the bug to wishlist and retitling accordingly.
It would be a real bug if lrc ignored these differences.

I've updated the man page to make it explicit that
license version differences are intentionally reported.

Please note, you can suppress these differences by using
lrc | grep -v 'GPL-3+          | GPL-3'
This leaves just four lines of file differences for kitty.


FYI
I'm considering adding some options to lrc,
including a brief or terse option which would limit output of blocks
of files with identical license differences to the first file only.
In the case of kitty, the result would be very similar to that above,
so should meet your requirement. There would just be one line
of GPL-3+ | GPL-3' which would not down out the rest of the output.

I was originally intending to tag this a 'wontfix', but my current thinking
is to leave it for now, and to close it when a terse option is added.

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