So, a "Global Lock" doesn't sound very good.  Any

So, a "Global Lock" doesn't sound very good.  Anyone with actual knowledge care to comment on what the hell that means?  Or what it could mean?

Like a DTC Chill, a Global Lock may last a few days or for an extended period of time, depending on the reason for the action. If the fundamental issue cause cannot be corrected, then the security will be removed from DTC’s depository, and transactions in the security subject to the Global Lock will no longer be eligible for clearing at any registered clearing agency. When this happens, clearance and settlement of open market trades is significantly delayed because trades can only occur upon physical delivery of stock certificates between the buyer and seller’s brokerage firms. In such circumstances it could take weeks for trades to clear and settle.