To ensure that all authers is known for each medie file. Only files that cannot include authers in the source are mentioned. 

Most graphics are by Iwan Gabovitch aka qubodup.

All of qubodup's graphics are in the Public domain
Data from the OpenArena team is under GPL v2
Data from the Trackballs team is under GPL v2
Poul Sander's files are multi licensed under "GPL v2 or later" OR "CC-BY-SA any version"

/fonts/
FreeSerif.ttf			Free Software Foundation
PenguinAttack.ttf		Dustin Norlander - GPLv2

/gfx/
14P_Arial_Angle_Red.png		Karl Bartel - http://user.cs.tu-berlin.de/~karlb/sfont/fonts.html
b1024.png			Poul Sander
bBack.png			Poul Sander
bBlank.png			Poul Sander
bChange.png			Poul Sander
bConnect.png			qubodup
bConfigure.png			qubodup
bEndless.png			qubodup
bExit.png			qubodup
bForward.png			Poul Sander
bHighScore.png			qubodup
bHost.png			qubodup
bHowToPlay.png			Poul Sander
bInternet.png			Poul Sander
bLoad.png			qubodup
bNetwork.png			qubodup
bNewGame.png			qubodup
bNext.png			Poul Sander
bOff.png			Poul Sander
bOn.png				Poul Sander
bOnePlayer.png			qubodup
bOptions.png			qubodup
bPuzzle.png			qubodup
bReplays.png			qubodup
bRetry.png			Poul Sander
bSave.png			qubodup
bSelectPuzzle.png		qubodup
bSkip.png			Poul Sander
bTheme.png			Poul Sander (based on qubodup's buttons)
bVsGameConfig.png		Poul Sander (based on qubodup's buttons)
bTimeTrial.png			qubodup
bVsGame.png			qubodup
bStageClear.png			qubodup
bTwoPlayers.png			qubodup
blockAttack.ico			Poul Sander
changeButtonsBack1.png		Poul Sander
iDraw.png			Poul Sander
changeButtonsBack.png		Poul Sander
iGameOver.png			Poul Sander
iLevelCheckBox.png		Poul Sander
iLevelCheckBoxMarked.png	Poul Sander
topscores.png			Poul Sander
crossover.png			Poul Sander
iLevelCheck.png			Poul Sander
transCover.png			Poul Sander
BackBoard.png			qubodup
dialogbox.png			Poul Sander
iLoser.png			Poul Sander
boardBackBack.png		qubodup
fileDialogbox.png		Poul Sander
iStageClearLimit.png		Poul Sander
background.png			qubodup
iWinner.png			Poul Sander
mouse.png			Poul Sander
blackBackGround.png		Poul Sander
options.png			Poul Sander
blackLine.png			Poul Sander
iCheckBoxArea.png		Poul Sander
chainFrame.png			Poul Sander
icon.png			Poul Sander

/gfx/bricks/
blue.png			qubodup
green.png			qubodup
grey.png			qubodup
purple.png			qubodup
red.png				qubodup
turkish.png			qubodup
yellow.png			qubodup

/gfx/smileys/
0.png				qubodup
1.png				qubodup
2.png				qubodup
3.png				qubodup

/gfx/animations/bomb/
bomb_1.png			Poul Sander
bomb_2.png			Poul Sander

/gfx/animations/cursor/
1.png				Poul Sander
2.png				Poul Sander

/gfx/animations/explosion/
0.png				openarena-svn887:/textures/sfx/130boom
1.png				openarena-svn887:/textures/sfx/130boom
2.png				openarena-svn887:/textures/sfx/130boom
3.png				openarena-svn887:/textures/sfx/130boom

/gfx/animations/ready/
ready_1.png			Poul Sander
ready_2.png			Poul Sander

/gfx/counter/
1.png				Poul Sander
2.png				Poul Sander
3.png				Poul Sander

/gfx/garbage/
garbageBL.png			qubodup
garbageBR.png			qubodup
garbageGML.png			qubodup
garbageGMR.png			qubodup
garbageML.png			qubodup
garbageMR.png			qubodup
garbageTL.png			qubodup
garbageTR.png			qubodup
garbageB.png			qubodup
garbageFill.png			qubodup
garbageGM.png			qubodup
garbageL.png			qubodup
garbageM.png			qubodup
garbageR.png			qubodup
garbageT.png			qubodup

/gfx/balls/
ballBlue.png			qubodup
ballGray.png			qubodup
ballGreen.png			qubodup
ballPurple.png			qubodup
ballRed.png			qubodup
ballTurkish.png			qubodup
ballYellow.png			qubodup

/sound/
pop.ogg				openarena-svn887:/sound/weapons/rocket/rockf1a.wav
cameraclick.ogg			openarean-svn887:/sound/misc/w_pkup.wav			
typing.ogg			openarena-svn887:/sound/world/clack.wav
counter.ogg			openarena-svn900:/sound/feedback/hitlo.wav
counterFinal.ogg		openarena-svn900:/sound/feedback/hit.wav
applause.ogg			(CC-BY 3.0) Blender Foundation - Cut by LeeZH (http://opengameart.org/content/applause)

/music/
bgMusic.ogg			Trackballs team (http://trackballs.sourceforge.net/) v 1.2 (GPL2), copy of tb_design.ogg
highbeat.ogg			Trackballs team (http://trackballs.sourceforge.net/) v 1.2 (GPL2), derived from tb_genesis.ogg