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770 of 825 SPDX-listed licenses/exceptions never appeared as either a declared or independently detected license anywhere in this scan. This is the full SPDX corpus, not scoped to what FreeBSD's own LICENSE framework recognizes -- expect most of these to be licenses no FreeBSD port would plausibly ever use.
SPDX idType
0BSDlicense
389-exceptionexception
3D-Slicer-1.0license
AALlicense
ADSLlicense
AFL-1.1license
AFL-1.2license
AFL-2.0license
AFL-3.0license
AGPL-1.0license
AGPL-1.0-onlylicense
AGPL-3.0license
ALGLIB-Documentationlicense
AMD-newliblicense
AMDPLPAlicense
AMLlicense
AML-glslanglicense
AMPASlicense
ANTLR-PDlicense
ANTLR-PD-fallbacklicense
APAFMLlicense
APL-1.0license
APSL-1.0license
APSL-1.1license
APSL-1.2license
APSL-2.0license
ASWF-Digital-Assets-1.0license
ASWF-Digital-Assets-1.1license
Abstyleslicense
AdaCore-doclicense
Adobe-2006license
Adobe-Display-PostScriptlicense
Adobe-Glyphlicense
Adobe-Utopialicense
Advanced-Cryptics-Dictionarylicense
Afmparselicense
Aladdinlicense
Apache-1.0license
Apache-1.1license
App-s2plicense
Arphic-1999license
Artistic-1.0-cl8license
Aspell-RUlicense
Asterisk-exceptionexception
Asterisk-linking-protocols-exceptionexception
Autoconf-exception-2.0exception
Autoconf-exception-3.0exception
Autoconf-exception-genericexception
Autoconf-exception-generic-3.0exception
Autoconf-exception-macroexception
BOLA-1.1license
BSD-1-Clauselicense
BSD-2-Clause-Darwinlicense
BSD-2-Clause-FreeBSDlicense
BSD-2-Clause-NetBSDlicense
BSD-2-Clause-Patentlicense
BSD-2-Clause-first-lineslicense
BSD-2-Clause-pkgconf-disclaimerlicense
BSD-3-Clause-LBNLlicense
BSD-3-Clause-Modificationlicense
BSD-3-Clause-No-Military-Licenselicense
BSD-3-Clause-No-Nuclear-Licenselicense
BSD-3-Clause-No-Nuclear-License-2014license
BSD-3-Clause-No-Nuclear-Warrantylicense
BSD-3-Clause-Open-MPIlicense
BSD-3-Clause-OpenWebUIlicense
BSD-3-Clause-Sunlicense
BSD-3-Clause-Tsolicense
BSD-3-Clause-acpicalicense
BSD-3-Clause-flexlicense
BSD-4-Clause-Shortenedlicense
BSD-4.3RENOlicense
BSD-4.3TAHOElicense
BSD-Advertising-Acknowledgementlicense
BSD-Attribution-HPND-disclaimerlicense
BSD-Inferno-Nettverklicense
BSD-Mark-Modificationslicense
BSD-Protectionlicense
BSD-Source-Codelicense
BSD-Source-Code-no-disclaimerlicense
BSD-Source-beginning-filelicense
BSD-Systemics-W3Workslicense
BSD-ask-to-endorselicense
BSL-1.0license
BUSL-1.1license
Baekmuklicense
Bahyphlicense
Barrlicense
Beerwarelicense
Bison-exception-1.24exception
Bison-exception-2.2exception
BitTorrent-1.0license
BitTorrent-1.1license
Bitstream-Charterlicense
Bitstream-Veralicense
BlueOak-1.0.0license
Boehm-GClicense
Boehm-GC-without-feelicense
Bootloader-exceptionexception
Borceuxlicense
Brian-Gladman-2-Clauselicense
Brian-Gladman-3-Clauselicense
Brian-Gladman-3-Clause-no-conversionlicense
Buddylicense
Bugrofflicense
C-UDA-1.0license
CAL-1.0license
CAL-1.0-Combined-Work-Exceptionlicense
CAPEC-toulicense
CATOSL-1.1license
CC-BY-1.0license
CC-BY-2.0license
CC-BY-2.5license
CC-BY-2.5-AUlicense
CC-BY-3.0license
CC-BY-3.0-ATlicense
CC-BY-3.0-AUlicense
CC-BY-3.0-DElicense
CC-BY-3.0-IGOlicense
CC-BY-3.0-NLlicense
CC-BY-3.0-USlicense
CC-BY-4.0license
CC-BY-NC-1.0license
CC-BY-NC-2.0license
CC-BY-NC-2.5license
CC-BY-NC-3.0license
CC-BY-NC-3.0-DElicense
CC-BY-NC-3.0-IGOlicense
CC-BY-NC-4.0license
CC-BY-NC-ND-1.0license
CC-BY-NC-ND-2.0license
CC-BY-NC-ND-2.5license
CC-BY-NC-ND-3.0license
CC-BY-NC-ND-3.0-DElicense
CC-BY-NC-ND-3.0-IGOlicense
CC-BY-NC-ND-4.0license
CC-BY-NC-SA-1.0license
CC-BY-NC-SA-2.0license
CC-BY-NC-SA-2.0-DElicense
CC-BY-NC-SA-2.0-FRlicense
CC-BY-NC-SA-2.0-UKlicense
CC-BY-NC-SA-2.5license
CC-BY-NC-SA-3.0license
CC-BY-NC-SA-3.0-DElicense
CC-BY-NC-SA-3.0-IGOlicense
CC-BY-NC-SA-4.0license
CC-BY-ND-1.0license
CC-BY-ND-2.0license
CC-BY-ND-2.5license
CC-BY-ND-3.0license
CC-BY-ND-3.0-DElicense
CC-BY-ND-4.0license
CC-BY-SA-1.0license
CC-BY-SA-2.0license
CC-BY-SA-2.0-UKlicense
CC-BY-SA-2.1-JPlicense
CC-BY-SA-2.5license
CC-BY-SA-3.0license
CC-BY-SA-3.0-ATlicense
CC-BY-SA-3.0-DElicense
CC-BY-SA-3.0-IGOlicense
CC-BY-SA-4.0license
CC-PDDClicense
CC-PDM-1.0license
CC-SA-1.0license
CDDL-1.0license
CDDL-1.1license
CDL-1.0license
CDLA-Permissive-1.0license
CDLA-Permissive-2.0license
CDLA-Sharing-1.0license
CECILL-1.0license
CECILL-1.1license
CECILL-2.0license
CECILL-2.1license
CECILL-Blicense
CECILL-Clicense
CERN-OHL-1.1license
CERN-OHL-1.2license
CERN-OHL-P-2.0license
CERN-OHL-S-2.0license
CERN-OHL-W-2.0license
CFITSIOlicense
CGAL-linking-exceptionexception
CLISP-exception-2.0exception
CMU-Machlicense
CMU-Mach-nodoclicense
CNRI-Jythonlicense
CNRI-Pythonlicense
CNRI-Python-GPL-Compatiblelicense
COIL-1.0license
CPAL-1.0license
CPL-1.0license
CPOL-1.02license
CUA-OPL-1.0license
Calderalicense
Caldera-no-preamblelicense
Catharonlicense
ClArtisticlicense
Classpath-exception-2.0exception
Classpath-exception-2.0-shortexception
Clipslicense
Community-Spec-1.0license
Condor-1.1license
Cornell-Lossless-JPEGlicense
Cronyxlicense
Crosswordlicense
CryptoSwiftlicense
CrystalStackerlicense
Cubelicense
D-FSL-1.0license
DEC-3-Clauselicense
DL-DE-BY-2.0license
DL-DE-ZERO-2.0license
DOClicense
DRL-1.0license
DRL-1.1license
DSDPlicense
DigiRule-FOSS-exceptionexception
Digia-Qt-LGPL-exception-1.1exception
DocBook-DTDlicense
DocBook-Schemalicense
DocBook-Stylesheetlicense
DocBook-XMLlicense
Dotseqnlicense
ECL-1.0license
ECL-2.0license
EFL-1.0license
EFL-2.0license
EPICSlicense
EPL-2.0license
ESA-PL-permissive-2.4license
ESA-PL-strong-copyleft-2.4license
ESA-PL-weak-copyleft-2.4license
EUDatagridlicense
EUPL-1.0license
EUPL-1.1license
EUPL-1.2license
Elastic-2.0license
Entessalicense
ErlPL-1.1license
Eurosymlicense
FBMlicense
FDK-AAClicense
FDK-MPEG-Hlicense
FLTK-exceptionexception
FSFAPlicense
FSFAP-no-warranty-disclaimerlicense
FSFULlicense
FSFULLRlicense
FSFULLRSDlicense
FSFULLRWDlicense
FSL-1.1-ALv2license
FSL-1.1-MITlicense
FTLlicense
Fairlicense
Fawkes-Runtime-exceptionexception
Ferguson-Twofishlicense
Font-exception-2.0exception
Frameworx-1.0license
FreeBSD-DOClicense
FreeImagelicense
Furusethlicense
GCC-exception-2.0exception
GCC-exception-2.0-noteexception
GCC-exception-3.1exception
GCR-docslicense
GDlicense
GFDL-1.1license
GFDL-1.1-invariants-onlylicense
GFDL-1.1-invariants-or-laterlicense
GFDL-1.1-no-invariants-onlylicense
GFDL-1.1-no-invariants-or-laterlicense
GFDL-1.1-onlylicense
GFDL-1.1-or-laterlicense
GFDL-1.2license
GFDL-1.2-invariants-onlylicense
GFDL-1.2-invariants-or-laterlicense
GFDL-1.2-no-invariants-onlylicense
GFDL-1.2-no-invariants-or-laterlicense
GFDL-1.2-onlylicense
GFDL-1.2-or-laterlicense
GFDL-1.3license
GFDL-1.3-invariants-onlylicense
GFDL-1.3-invariants-or-laterlicense
GFDL-1.3-no-invariants-onlylicense
GFDL-1.3-no-invariants-or-laterlicense
GFDL-1.3-onlylicense
GFDL-1.3-or-laterlicense
GL2PSlicense
GLWTPLlicense
GNAT-exceptionexception
GNOME-examples-exceptionexception
GNU-compiler-exceptionexception
GPL-1.0license
GPL-2.0+license
GPL-2.0-with-GCC-exceptionlicense
GPL-2.0-with-autoconf-exceptionlicense
GPL-2.0-with-bison-exceptionlicense
GPL-2.0-with-classpath-exceptionlicense
GPL-2.0-with-font-exceptionlicense
GPL-3.0license
GPL-3.0-389-ds-base-exceptionexception
GPL-3.0-interface-exceptionexception
GPL-3.0-linking-exceptionexception
GPL-3.0-linking-source-exceptionexception
GPL-3.0-with-GCC-exceptionlicense
GPL-3.0-with-autoconf-exceptionlicense
GPL-CC-1.0exception
GStreamer-exception-2005exception
GStreamer-exception-2008exception
Game-Programming-Gemslicense
Giftwarelicense
Glidelicense
Glulxelicense
Gmsh-exceptionexception
Google-Patent-WebMexception
Graphics-Gemslicense
Gutmannlicense
HDF5license
HIDAPIlicense
HP-1986license
HP-1989license
HPNDlicense
HPND-DEClicense
HPND-Fenneberg-Livingstonlicense
HPND-INRIA-IMAGlicense
HPND-Intellicense
HPND-Kevlin-Henneylicense
HPND-MIT-disclaimerlicense
HPND-Markus-Kuhnlicense
HPND-Netreklicense
HPND-Pbmpluslicense
HPND-SMClicense
HPND-UClicense
HPND-UC-export-USlicense
HPND-doclicense
HPND-doc-selllicense
HPND-export-USlicense
HPND-export-US-acknowledgementlicense
HPND-export-US-modifylicense
HPND-export2-USlicense
HPND-merchantability-variantlicense
HPND-sell-MIT-disclaimer-xserverlicense
HPND-sell-regexprlicense
HPND-sell-variantlicense
HPND-sell-variant-MIT-disclaimerlicense
HPND-sell-variant-MIT-disclaimer-revlicense
HPND-sell-variant-critical-systemslicense
HTMLTIDYlicense
HaskellReportlicense
Hippocratic-2.1license
Hippocratic-3.0-corelicense
IBM-pibslicense
ICUlicense
IEC-Code-Components-EULAlicense
IJGlicense
IJG-shortlicense
IPAlicense
IPL-1.0license
ISC-Veillardlicense
ISO-permissionlicense
ImageMagicklicense
Imlib2license
Independent-modules-exceptionexception
Info-ZIPlicense
Informaticalicense
Inner-Net-2.0license
InnoSetuplicense
Intellicense
Intel-ACPIlicense
Interbase-1.0license
JPL-imagelicense
JPNIClicense
JSONlicense
Jamlicense
JasPer-2.0license
Kastruplicense
Kazliblicense
KiCad-libraries-exceptionexception
Knuth-CTANlicense
LAL-1.2license
LAL-1.3license
LGPL-2.0license
LGPL-2.0+license
LGPL-2.1+license
LGPL-3.0license
LGPL-3.0+license
LGPL-3.0-linking-exceptionexception
LGPLLRlicense
LLGPLexception
LLVM-exceptionexception
LOOPlicense
LPD-documentlicense
LPL-1.0license
LPL-1.02license
LPPL-1.0license
LPPL-1.1license
LPPL-1.2license
LPPL-1.3alicense
LPPL-1.3clicense
LZMA-SDK-9.11-to-9.20license
LZMA-SDK-9.22license
LZMA-exceptionexception
Latex2elicense
Latex2e-translated-noticelicense
Leptonicalicense
LiLiQ-P-1.1license
LiLiQ-R-1.1license
LiLiQ-Rplus-1.1license
Libpnglicense
Libtool-exceptionexception
Linux-OpenIBlicense
Linux-man-pages-1-paralicense
Linux-man-pages-copyleftlicense
Linux-man-pages-copyleft-2-paralicense
Linux-man-pages-copyleft-varlicense
Linux-syscall-noteexception
Lucida-Bitmap-Fontslicense
MIPSlicense
MIT-0license
MIT-CMUlicense
MIT-Clicklicense
MIT-Festivallicense
MIT-Khronos-oldlicense
MIT-STKlicense
MIT-Wulicense
MIT-advertisinglicense
MIT-ennalicense
MIT-fehlicense
MIT-open-grouplicense
MIT-testregexlicense
MITNFAlicense
MMIXwarelicense
MMPL-1.0.1license
MPEG-SSGlicense
MPL-1.0license
MPL-1.1license
MPL-2.0-no-copyleft-exceptionlicense
MS-LPLlicense
MS-PLlicense
MS-RLlicense
MTLLlicense
MVT-1.1license
Mackerras-3-Clauselicense
Mackerras-3-Clause-acknowledgmentlicense
MakeIndexlicense
Martin-Birgmeierlicense
McPhee-slideshowlicense
Minpacklicense
MirOSlicense
Motosotolicense
MulanPSL-1.0license
MulanPSL-2.0license
Multicslicense
Muplicense
NAIST-2003license
NASA-1.3license
NBPL-1.0license
NCBI-PDlicense
NCGL-UK-2.0license
NCLlicense
NGPLlicense
NICTA-1.0license
NIST-PDlicense
NIST-PD-TNTlicense
NIST-PD-fallbacklicense
NIST-Softwarelicense
NLOD-1.0license
NLOD-2.0license
NLPLlicense
NOSLlicense
NPL-1.0license
NPL-1.1license
NPOSL-3.0license
NRLlicense
NTIA-PDlicense
NTP-0license
Naumenlicense
Net-SNMPlicense
NetCDFlicense
Newsletrlicense
Nokialicense
Nokia-Qt-exception-1.1exception
Noweblicense
Nunitlicense
O-UDA-1.0license
OARlicense
OCCT-PLlicense
OCCT-exception-1.0exception
OCLC-2.0license
OCaml-LGPL-linking-exceptionexception
ODC-By-1.0license
ODbL-1.0license
OFFISlicense
OFL-1.0license
OFL-1.0-RFNlicense
OFL-1.0-no-RFNlicense
OFL-1.1license
OFL-1.1-RFNlicense
OFL-1.1-no-RFNlicense
OGC-1.0license
OGDL-Taiwan-1.0license
OGL-Canada-2.0license
OGL-UK-1.0license
OGL-UK-2.0license
OGL-UK-3.0license
OGTSLlicense
OLDAP-1.1license
OLDAP-1.2license
OLDAP-1.3license
OLDAP-1.4license
OLDAP-2.0license
OLDAP-2.0.1license
OLDAP-2.1license
OLDAP-2.2license
OLDAP-2.2.1license
OLDAP-2.2.2license
OLDAP-2.3license
OLDAP-2.4license
OLDAP-2.5license
OLDAP-2.6license
OLDAP-2.7license
OLDAP-2.8license
OLFL-1.3license
OMLlicense
OPL-1.0license
OPL-UK-3.0license
OPUBL-1.0license
OSC-1.0license
OSL-1.0license
OSL-1.1license
OSL-2.0license
OSL-2.1license
OSL-3.0license
OSSPlicense
OpenJDK-assembly-exception-1.0exception
OpenMDW-1.0license
OpenPBS-2.3license
OpenSSLlicense
OpenSSL-standalonelicense
OpenVisionlicense
PADLlicense
PCRE2-exceptionexception
PDDL-1.0license
PPLlicense
PS-or-PDF-font-exception-20170817exception
ParaType-Free-Font-1.3license
Parity-6.0.0license
Parity-7.0.0license
Plexuslicense
PolyForm-Noncommercial-1.0.0license
PolyForm-Small-Business-1.0.0license
Python-2.0license
Python-2.0.1license
QPL-1.0license
QPL-1.0-INRIA-2004license
QPL-1.0-INRIA-2004-exceptionexception
Qhulllicense
Qt-GPL-exception-1.0exception
Qt-LGPL-exception-1.1exception
Qwt-exception-1.0exception
RHeCos-1.1license
RPL-1.1license
RPL-1.5license
RPSL-1.0license
RRDtool-FLOSS-exception-2.0exception
RSA-MDlicense
RSCPLlicense
Rdisclicense
Ruby-ptylicense
SANE-exceptionexception
SAX-PDlicense
SAX-PD-2.0license
SCEAlicense
SGI-B-1.0license
SGI-B-1.1license
SGI-B-2.0license
SGI-OpenGLlicense
SGMLUG-PMlicense
SGP4license
SHL-0.5license
SHL-0.51license
SHL-2.0exception
SHL-2.1exception
SISSLlicense
SISSL-1.2license
SLlicense
SMAIL-GPLlicense
SMLNJlicense
SMPPLlicense
SNIAlicense
SOFAlicense
SPL-1.0license
SSH-OpenSSHlicense
SSH-shortlicense
SSLeay-standalonelicense
SSPL-1.0license
SUL-1.0license
SWI-exceptionexception
SWLlicense
Saxpathlicense
SchemeReportlicense
Sendmaillicense
Sendmail-8.23license
Sendmail-Open-Source-1.1license
SimPL-2.0license
Simple-Library-Usage-exceptionexception
Sleepycatlicense
Soundexlicense
Spelling-Provider-LGPL-exceptionexception
Spencer-86license
Spencer-94license
Spencer-99license
StandardML-NJlicense
SugarCRM-1.1.3license
Sun-PPPlicense
Sun-PPP-2000license
SunProlicense
Swift-exceptionexception
Symlinkslicense
TAPR-OHL-1.0license
TCLlicense
TCP-wrapperslicense
TGPPL-1.0license
TMatelicense
TORQUE-1.1license
TOSLlicense
TPDLlicense
TPL-1.0license
TTWLlicense
TTYP0license
TU-Berlin-1.0license
TU-Berlin-2.0license
TekHVClicense
TermReadKeylicense
Texinfo-exceptionexception
ThirdEyelicense
TrustedQSLlicense
UBDL-exceptionexception
UCARlicense
UCL-1.0license
UMich-Meritlicense
UPL-1.0license
URT-RLElicense
Ubuntu-font-1.0license
UnRARlicense
Unicode-3.0license
Unicode-DFS-2015license
Unicode-DFS-2016license
Unicode-TOUlicense
Universal-FOSS-exception-1.0exception
UnixCryptlicense
Unlicense-libtelnetlicense
Unlicense-libwhirlpoollicense
VOSTROMlicense
VSL-1.0license
Vimlicense
Vixie-Cronlicense
W3Clicense
W3C-19980720license
W3C-20150513license
WTFNMFPLlicense
Watcom-1.0license
Widget-Workshoplicense
WordNetlicense
Wsuipalicense
WxWindows-exception-3.1exception
X11license
X11-no-permit-personslicense
X11-swappedlicense
XFree86-1.1license
XSkatlicense
Xdebug-1.03license
Xeroxlicense
Xfiglicense
Xnetlicense
YPL-1.0license
YPL-1.1license
ZPL-1.1license
ZPL-2.0license
Zedlicense
Zeefflicense
Zend-2.0license
Zimbra-1.3license
Zimbra-1.4license
Zliblicense
any-OSI-perl-moduleslicense
atc-gamelicense
bcrypt-Solar-Designerlicense
blessinglicense
bzip2-1.0.5license
bzip2-1.0.6license
check-cvslicense
checkmklicense
copyleft-next-0.3.0license
copyleft-next-0.3.1license
cryptsetup-OpenSSL-exceptionexception
curllicense
cve-toulicense
diffmarklicense
dtoalicense
dvipdfmlicense
eCos-2.0license
eCos-exception-2.0exception
eGenixlicense
erlang-otp-linking-exceptionexception
etalab-2.0license
fmt-exceptionexception
freertos-exception-2.0exception
fwlwlicense
gSOAP-1.3blicense
generic-xtslicense
gnu-javamail-exceptionexception
gnuplotlicense
gtkbooklicense
harbour-exceptionexception
hdparmlicense
hyphen-bulgarianlicense
i2p-gpl-java-exceptionexception
iMatixlicense
jovelicense
kvirc-openssl-exceptionexception
libpng-1.6.35license
libpng-2.0license
libpri-OpenH323-exceptionexception
libselinux-1.0license
libtifflicense
libutil-David-Nugentlicense
lsoflicense
magazlicense
mailpriolicense
man2htmllicense
metamaillicense
mif-exceptionexception
mpi-permissivelicense
mpich2license
mpluslicense
mxml-exceptionexception
ngreplicense
openvpn-openssl-exceptionexception
pkgconflicense
pnmstitchlicense
polyparse-exceptionexception
psfraglicense
psutilslicense
python-ldaplicense
radvdlicense
romic-exceptionexception
rsync-linking-exceptionexception
snprintflicense
softSurferlicense
sqlitestudio-OpenSSL-exceptionexception
ssh-keyscanlicense
stunnel-exceptionexception
swrulelicense
threeparttablelicense
u-boot-exception-2.0exception
ulemlicense
vsftpd-openssl-exceptionexception
w3mlicense
wwllicense
wxWindowslicense
x11vnc-openssl-exceptionexception
xinetdlicense
xkeyboard-config-Zinovievlicense
xlocklicense
xpplicense
xzoomlicense
zlib-acknowledgementlicense