, ▁transfer ▁agent , ▁federal ▁or ▁state ▁regul ators , ▁or ▁federal ▁or ▁state ▁law ▁enfor cement ▁officials ▁that ▁an ▁issu ance ▁of ▁some ▁or ▁all ▁of ▁the ▁iss uer ' s ▁se cur ities ▁or ▁transfer ▁in ▁those ▁se cur ities ▁is ▁in ▁viol ation ▁of ▁state ▁or ▁federal ▁law . ▁If ▁D TC ▁suspect s ▁that ▁all ▁or ▁a ▁portion ▁of ▁its ▁hold ings ▁of ▁a ▁security ▁may ▁not ▁be ▁freely ▁transfer able ▁as ▁is ▁required ▁for ▁D TC ▁services , ▁it ▁may ▁decide ▁to ▁ch ill ▁one ▁or ▁more ▁of ▁its ▁services ▁or ▁place ▁a ▁free ze ▁on ▁all ▁services ▁for ▁the ▁security . ▁When ▁there ▁is ▁a ▁corpor ate ▁action , ▁D TC ▁will ▁tempor arily ▁ch ill ▁the ▁security ▁for ▁book - entry ▁activities . ▁In ▁other ▁instances , ▁a ▁corpor ate ▁action ▁can ▁cause ▁a ▁more ▁permanent ▁ch ill . ▁This ▁may ▁force ▁the ▁iss uer ▁to ▁re apply ▁for ▁el ig ibility ▁altogether . ▁ ▁When ▁D TC ▁ch ills ▁or ▁free zes ▁a ▁security , ▁it ▁will ▁issue ▁a ▁“ Part icip ant ▁Notice ” ▁to ▁its ▁participants . ▁These ▁not ices ▁are ▁public ly ▁available ▁on ▁D TC ' s ▁website . ▁ ▁When ▁se cur ities ▁are ▁fro zen , ▁D TC ▁also ▁provides ▁optional ▁autom ated ▁notifications ▁to ▁its ▁participants . ▁These ▁processes ▁provide ▁participants ▁the ▁ability ▁to ▁update ▁their ▁systems ▁to ▁automatically ▁block ▁future ▁trad ing ▁of ▁affected ▁se cur ities , ▁in ▁addition ▁to ▁alert ing ▁particip ant ▁comp liance