Yes, a chill really only impacts the issuer. The DTC, as owner of Cede, will not allow any new certs to be deposited, hence a company can't issue any additional shares. Now there are a few ways around it, but it is very difficult.
With a chill usually the conservative on line brokers will stop allowing purchase orders, like a Scottrade.
A global lock eliminates all ability to issue new trades and 99% of the brokers won't let you trade it although most will allow you to write it off.
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