▁on ▁the ▁reason ▁for ▁the ▁free ze . ▁If ▁the ▁reasons ▁for ▁the ▁free ze ▁cannot ▁be ▁rect ified , ▁then ▁the ▁security ▁will ▁generally ▁be ▁removed ▁from ▁D TC , ▁and ▁se cur ities ▁transactions ▁in ▁that ▁security ▁will ▁no ▁longer ▁be ▁el ig ible ▁to ▁be ▁cleared ▁at ▁any ▁registered ▁clear ing ▁ag ency . ▁Ch ills ▁and ▁free zes ▁are ▁monitor ed ▁by ▁D TC ' s ▁Office ▁of ▁Reg ul atory ▁Comp liance . ▁ ▁D TC ▁impos es ▁ch ills ▁and ▁free zes ▁on ▁se cur ities ▁for ▁various ▁reasons . ▁For ▁example , ▁D TC ▁may ▁imp ose ▁a ▁ch ill ▁on ▁a ▁security ▁because ▁the ▁iss uer ▁no ▁longer ▁has ▁a ▁transfer ▁agent ▁to ▁facil itate ▁the ▁transfer ▁of ▁the ▁security ▁or ▁the ▁transfer ▁agent ▁is ▁not ▁comp lying ▁with ▁D TC ▁rules ▁in ▁its ▁interactions ▁with ▁D TC ▁in ▁transfer ring ▁the ▁security . ▁O ften ▁this ▁type ▁of ▁situation ▁is ▁resolved ▁within ▁a ▁short ▁period ▁of ▁time . ▁ ▁Ch ills ▁and ▁free zes ▁can ▁be ▁im posed ▁on ▁se cur ities ▁for ▁more ▁complicated ▁reasons , ▁such ▁as ▁when ▁D TC ▁determ ines ▁that ▁there ▁may ▁be ▁a ▁legal , ▁regul atory , ▁or ▁oper ational ▁problem ▁with ▁the ▁issu ance ▁of ▁the ▁security , ▁or ▁the ▁trad ing ▁or ▁clear ing ▁of ▁transactions ▁involving ▁the ▁security . ▁For ▁example , ▁D TC ▁may ▁ch ill ▁or ▁free ze ▁a ▁security ▁when ▁D TC ▁becomes ▁aware ▁or ▁is ▁informed ▁by ▁the ▁iss uer