▁credit ▁card , ▁use ▁of ▁a ▁phone ▁card , ▁call ▁from ▁home , ▁checked ▁out ▁library ▁book , ▁r ented ▁video , ▁or ▁otherwise ▁complete ▁recorded ▁transaction ▁generates ▁an ▁electronic ▁record . ▁Public ▁records — such ▁as ▁birth , ▁court , ▁tax ▁and ▁other ▁records — are ▁increasing ly ▁being ▁digit ized ▁and ▁made ▁available ▁online . ▁In ▁addition , ▁due ▁to ▁laws ▁like ▁CA LE A , ▁web ▁traffic ▁and ▁online ▁purch ases ▁are ▁also ▁available ▁for ▁profil ing . ▁Electron ic ▁record - keep ing ▁makes ▁data ▁easily ▁collect able , ▁stor able , ▁and ▁accessible — so ▁that ▁high - volume , ▁efficient ▁aggreg ation ▁and ▁analysis ▁is ▁possible ▁at ▁significantly ▁lower ▁costs . ▁ ▁Information ▁rel ating ▁to ▁many ▁of ▁these ▁individual ▁transactions ▁is ▁often ▁easily ▁available ▁because ▁it ▁is ▁generally ▁not ▁guard ed ▁in ▁isol ation , ▁since ▁the ▁information , ▁such ▁as ▁the ▁title ▁of ▁a ▁movie ▁a ▁person ▁has ▁r ented , ▁might ▁not ▁seem ▁sensitive . ▁However , ▁when ▁many ▁such ▁transactions ▁are ▁aggreg ated ▁they ▁can ▁be ▁used ▁to ▁assemble ▁a ▁detailed ▁profile ▁reve aling ▁the ▁actions , ▁hab its , ▁belief s , ▁locations ▁frequ ented , ▁social ▁connections , ▁and ▁prefer ences ▁of ▁the ▁individual . ▁This ▁profile ▁is ▁then ▁used , ▁by ▁programs ▁such ▁as ▁AD VI SE ▁and ▁T AL ON , ▁to ▁determine ▁whether ▁the ▁person ▁is ▁a ▁military , ▁criminal , ▁or ▁political ▁threat . ▁ ▁In ▁addition ▁to ▁its ▁own ▁aggreg ation ▁and ▁profil ing ▁tools ,