# if any package within their module is copied.
exists vendor/a/foo/AUTHORS.txt
exists vendor/a/foo/CONTRIBUTORS
exists vendor/a/foo/LICENSE
exists vendor/a/foo/PATENTS
exists vendor/a/foo/COPYING
exists vendor/a/foo/COPYLEFT
exists vendor/x/NOTICE!
exists vendor/mysite/myname/mypkg/LICENSE.txt

! exists vendor/a/foo/licensed-to-kill
! exists vendor/w
! exists vendor/w/LICENSE
! exists vendor/x/x2
! exists vendor/x/x2/LICENSE

  - W3C
  - Xnet
  - Zlib

reciprocal_licenses:
  - CC0-1.0
  - APSL-2.0
  - CDDL-1.0
  - CDDL-1.1
  - CPL-1.0
  - EPL-1.0
  - IPL-1.0
  - MPL-1.0
  - MPL-1.1
  - MPL-2.0
  - MPL-2.0-no-copyleft-exception
  - Ruby

restricted_licenses:
  - GPL-1.0-only
  - GPL-1.0-or-later
  - GPL-2.0-only
  - GPL-2.0-or-later
  - GPL-3.0-only
  - GPL-3.0-or-later
  - LGPL-2.0-only
  - LGPL-2.0-or-later

// to nudge people toward more agreement on the naming
// and also trying to avoid false positives.
var metaPrefixes = []string{
	"AUTHORS",
	"CONTRIBUTORS",
	"COPYLEFT",
	"COPYING",
	"COPYRIGHT",
	"LEGAL",
	"LICENSE",
	"NOTICE",
	"PATENTS",
}

// matchMetadata reports whether info is a metadata file.
func matchMetadata(dir string, info fs.DirEntry) bool {

 Everyone is permitted to copy and distribute verbatim copies
 of this license document, but changing it is not allowed.

                            Preamble

  The GNU Affero General Public License is a free, copyleft license for
software and other kinds of works, specifically designed to ensure
cooperation with the community in the case of network server software.

1F12D         ; mapped                 ; 0063 0064     # 5.2  CIRCLED CD
1F12E         ; mapped                 ; 0077 007A     # 5.2  CIRCLED WZ
1F12F         ; valid                  ;      ; NV8    # 11.0 COPYLEFT SYMBOL
1F130         ; mapped                 ; 0061          # 6.0  SQUARED LATIN CAPITAL LETTER A
1F131         ; mapped                 ; 0062          # 5.2  SQUARED LATIN CAPITAL LETTER B