I don't mind giving the ID as needed. However given that some web companies are somewhat of an unknown quantity when it comes to the credibility that large brick and mortar institutions like banks and brokerage houses have worked to command, I do sometimes find it causes me to pause for a moment when asked to fax or email copies of driver's licenses etc. to them. Also, the banks and brokerage houses are heavily regulated while some entities on the net are not subject to the same levels of oversight.
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