YouSendIt is a file-sharing service focused on business-oriented uses such as: lawyers sharing files with lawyers or companies sharing files with their manufacturing partners overseas, or physicians sharing medical images.

FORBES: YouSendIt Launches File Syncing, Takes On Dropbox

But for federal authorities trying to put a stop to 3-D gun files, sharing it might already be too little, too late.

CNN: SHARE THIS

The FBI acknowledged that relying on paper files inhibited sharing of data among agents in field offices and with headquarters, possibly hurting its chances of thwarting the attacks.

WSJ: FBI Files Go Digital, After Delays and Cost Overruns