typewriter.ogg is modified from https://www.freesoundslibrary.com/typewriter-sound/ which is licensed under the CC BY 4.0 License. This modified file follows the same license.
dry_fire.ogg from tgstation at https://github.com/tgstation/tgstation/blob/master/sound/weapons/gun/general/dry_fire.ogg which is licensed under the CC-BY-SA 3.0 
laser.ogg from tgstation at https://github.com/tgstation/tgstation/blob/master/sound/weapons/laser.ogg which is licensed under the CC-BY-SA 3.0