Files marked as "GPL" can be used without any constraint.
Files marked as GPL require that you respect one of the GPL : http://www.gnu.org/licenses/
All the original code in WiiFlow is in Public Domain (or WTFPL if GPL is not possible)


source/

|  File           |  Comment   |  Lic |  Original author(s)        |  Project where the original code is
|-----------------|------------|------|----------------------------|------------------------------------
| boxmesh.cpp     |            | GPL  |                            | WiiFlow 1.1
| boxmesh.hpp     |            | GPL  |                            | WiiFlow 1.1
| cheat.cpp       |            | GPL  |                            | WiiFlow 1.1
| cheat.hpp       |            | GPL  |                            | WiiFlow 1.1
| config.cpp      |            | GPL  |                            | WiiFlow 1.1
| config.hpp      |            | GPL  |                            | WiiFlow 1.1
| cursor.cpp      |            | GPL  |                            | WiiFlow 1.1
| cursor.hpp      |            | GPL  |                            | WiiFlow 1.1
| dns.c           |            | GPL  | PaulWagener                | WiiEarth
| dns.h           |            | GPL  | PaulWagener                | WiiEarth
| FreeTypeGX.cpp  | Modified   | GPL  | Armin Tamzarian            | http://code.google.com/p/freetypegx/
| FreeTypeGX.hpp  | Modified   | GPL  | Armin Tamzarian            | http://code.google.com/p/freetypegx/
| gui.cpp         |            | GPL  |                            | WiiFlow 1.1
| gui.hpp         |            | GPL  |                            | WiiFlow 1.1
| http.c          | Modified   | GPL  | PaulWagener                | WiiEarth
| http.h          | Modified   | GPL  | PaulWagener                | WiiEarth
| main.cpp        |            | GPL  |                            | WiiFlow 1.1
| mem2.cpp        |            | GPL  |                            | WiiFlow 1.1
| mem2.hpp        |            | GPL  |                            | WiiFlow 1.1
| mem2alloc.cpp   |            | GPL  |                            | WiiFlow 1.1
| mem2alloc.hpp   |            | GPL  |                            | WiiFlow 1.1
| Metaphrasis.cpp | Modified   | GPL  | Armin Tamzarian            | http://code.google.com/p/metaphrasis/
| Metaphrasis.h   | Modified   | GPL  | Armin Tamzarian            | http://code.google.com/p/metaphrasis/
| objalloc.cpp    |            | GPL  |                            | WiiFlow 1.1
| objalloc.hpp    |            | GPL  |                            | WiiFlow 1.1
| oggplayer.c     | Modified   | GPL  | Hermes                     | Modified version from LibWiiGui
| oggplayer.h     | Modified   | GPL  | Hermes                     | Modified version from LibWiiGui
| pngu.c          | Modified   | ?    |                            | http://frontier-dev.net
| pngu.h          | Modified   | ?    |                            | http://frontier-dev.net
| smartalloc.cpp  |            | GPL  |                            | WiiFlow 1.1
| smartptr.hpp    |            | GPL  |                            | WiiFlow 1.1
| sound.cpp       |            | GPL  |                            | WiiFlow 1.1
| sound.hpp       |            | GPL  |                            | WiiFlow 1.1
| text.cpp        |            | GPL  |                            | WiiFlow 1.1
| text.hpp        |            | GPL  |                            | WiiFlow 1.1
| texture.cpp     |            | GPL  |                            | WiiFlow 1.1 Optimization : "Real-Time DXT Compression" by J.M.P. van Waveren (c) 2006 Id Software, Inc.
| texture.hpp     |            | GPL  |                            | WiiFlow 1.1
| vector.hpp      |            | GPL  |                            | WiiFlow 1.1
| video.cpp       |            | GPL  |                            | WiiFlow 1.1
| video.hpp       |            | GPL  |                            | WiiFlow 1.1
| wstringEx.cpp   |            | GPL  |                            | WiiFlow 1.1 R8
| wstringEx.hpp   |            | GPL  |                            | WiiFlow 1.1 R8
--------------------------------------------------------------------------------------------------------


source/data/

|  File           |  Comment   |  Lic |  Original author(s)        |  Project where the original code is
|-----------------|------------|------|----------------------------|------------------------------------
| *.c             | Generated  |      |                            | WiiFlow 1.1
--------------------------------------------------------------------------------------------------------


source/loader/

|  File           |  Comment   |  Lic |  Original author(s)        |  Project where the original code is
|-----------------|------------|------|----------------------------|------------------------------------
| alt_ios.c       | Modified   | GPL  | Hermes                     | uLoader 3.0C
| alt_ios.h       | Modified   | GPL  | Hermes                     | uLoader 3.0C
| apploader.c     | Modified   | GPL  | Waninkoko, WiiPower        | USB Loader 1.5, NeoGamma
| apploader.h     | Modified   | GPL  | Waninkoko, WiiPower        | USB Loader 1.5, NeoGamma
| dip_plugin_2.c  |            | GPL  | Hermes                     | uLoader
| dip_plugin_2.h  |            | GPL  | Hermes                     | uLoader
| dip_plugin_3.c  |            | GPL  | Hermes                     | uLoader 2.6
| dip_plugin_3.h  |            | GPL  | Hermes                     | uLoader 2.6
| dip_plugin_4.c  |            | GPL  | Hermes                     | uLoader 3.1
| dip_plugin_4.h  |            | GPL  | Hermes                     | uLoader 3.1
| disc.c          | Modified   | GPL  | Kwiirk, Waninkoko, Hermes  | YAL, USB Loader 1.5, uLoader 3.0C
| disc.h          | Modified   | GPL  | Kwiirk, Waninkoko, Hermes  | YAL, USB Loader 1.5, uLoader 3.0C
| ehcmodule_2.c   |            | GPL  | Kwiirk?, Hermes            | uLoader
| ehcmodule_2.h   |            | GPL  | Kwiirk?, Hermes            | uLoader
| ehcmodule_3.c   |            | GPL  | Kwiirk?, Hermes            | uLoader 2.6
| ehcmodule_3.h   |            | GPL  | Kwiirk?, Hermes            | uLoader 2.6
| ehcmodule_4.c   |            | GPL  | Kwiirk?, Hermes            | uLoader 3.1
| ehcmodule_4.h   |            | GPL  | Kwiirk?, Hermes            | uLoader 3.1
| fat.c           |            | GPL  |                            | WiiFlow 1.1
| fat.h           |            | GPL  |                            | WiiFlow 1.1
| fwrite_patch.h  |            | GPL  | Nuke, Brkirch              | http://code.google.com/p/usbgecko/
| geckomenu.h     |            | GPL  | Nuke, Brkirch              | http://code.google.com/p/usbgecko/
| kenobiwii.c     |            | GPL  | Nuke, Brkirch              | http://code.google.com/p/usbgecko/
| load_dol.c      |            | GPL  | Shagkur?                   | ftpii, uLoader 3.0C
| load_dol.h      |            | GPL  | Shagkur?                   | ftpii, uLoader 3.0C
| mload.c         |            | GPL  | Hermes                     | uLoader 3.0C
| mload.h         |            | GPL  | Hermes                     | uLoader 3.0C
| partition.c     |            | GPL  | Waninkoko?                 | USB Loader 1.5
| partition.h     |            | GPL  | Waninkoko?                 | USB Loader 1.5
| patchcode.c     | Modified   | GPL  | Nuke, Brkirch              | http://code.google.com/p/usbgecko/
| patchcode.h     | Modified   | GPL  | Nuke, Brkirch              | http://code.google.com/p/usbgecko/
| patchhook.S     |            | GPL  | Nuke, Brkirch              | http://code.google.com/p/usbgecko/
| ppc.h           |            | GPL  |                            | http://code.google.com/p/usbgecko/
| sdhc.c          | Modified   | GPL  | Waninkoko                  | USB Loader 1.5
| sdhc.h          | Modified   | GPL  | Waninkoko                  | USB Loader 1.5
| sys.c           | Modified   | GPL  | Waninkoko                  | USB Loader 1.5
| sys.h           | Modified   | GPL  | Waninkoko                  | USB Loader 1.5
| usbstorage.c    | Modified   | GPL  | Kwiirk, Hermes             | YAL, USB Loader 1.5, uLoader 3.0C
| usbstorage.h    | Modified   | GPL  | Kwiirk                     | YAL, USB Loader 1.5, uLoader 3.0C
| utils.c         |            | GPL  | Waninkoko                  | USB Loader 1.5
| utils.h         |            | GPL  | Waninkoko                  | USB Loader 1.5
| utils.c         |            | GPL  | Waninkoko                  | USB Loader 1.5
| utils.h         |            | GPL  | Waninkoko                  | USB Loader 1.5
| videopatch.c    | Rewritten  | GPL  | WiiPower?                  | NeoGamma
| videopatch.h    | Rewritten  | GPL  | WiiPower?                  | NeoGamma
| wbfs.c          | Modified   | GPL  | Waninkoko                  | USB Loader 1.5
| wbfs.h          | Modified   | GPL  | Waninkoko                  | USB Loader 1.5
| wdvd.c          | Modified   | GPL  | Kwiirk, Hermes, Waninkoko  | USB Loader 1.5
| wdvd.h          | Modified   | GPL  | Kwiirk, Hermes, Waninkoko  | USB Loader 1.5
--------------------------------------------------------------------------------------------------------


source/libs/libwbfs/

|  File           |  Comment   |  Lic |  Original author(s)        |  Project where the original code is
|-----------------|------------|------|----------------------------|------------------------------------
| libwbfs.c       | Modified   | GPL  | Kwiirk                     | YAL?
| libwbfs.h       | Modified   | GPL  | Kwiirk                     | YAL?
| libwbfs_os.h    | Modified   | GPL  | Kwiirk                     | YAL?
| rijndael.c      |            | ?    | Mike Scott                 | 
| wiidisc.c       | Modified   | GPL  | Kwiirk                     | YAL?
| wiidisc.h       | Modified   | GPL  | Kwiirk                     | YAL?
--------------------------------------------------------------------------------------------------------


source/menu/

|  File           |  Comment   |  Lic |  Original author(s)        |  Project where the original code is
|-----------------|------------|------|----------------------------|------------------------------------
| *.cpp, *hpp     |            | GPL   |                            | WiiFlow 1.1
--------------------------------------------------------------------------------------------------------


include

|  File           |  Comment   |  Lic |  Original author(s)        |  Project where the original code is
|-----------------|------------|------|----------------------------|------------------------------------
| ft2build.h      |            | ?    |                            | FreeType
| png.h           |            | PNG  |                            | http://www.libpng.org
| pngconf.h       | Modified   | PNG  |                            | http://www.libpng.org
--------------------------------------------------------------------------------------------------------


include/freetype

|  File           |  Comment   |  Lic |  Original author(s)        |  Project where the original code is
|-----------------|------------|------|----------------------------|------------------------------------
| *.h             |            | ?    |                            | FreeType
--------------------------------------------------------------------------------------------------------


include/tremor

|  File           |  Comment   |  Lic |  Original author(s)        |  Project where the original code is
|-----------------|------------|------|----------------------------|------------------------------------
| *.h             |            | ?    |                            | Tremor
--------------------------------------------------------------------------------------------------------


lib

|  File           |  Comment   |  Lic |  Original author(s)        |  Project where the original code is
|-----------------|------------|------|----------------------------|------------------------------------
| *.a             |            |      |                            | 
--------------------------------------------------------------------------------------------------------