An extra $200 or so may be charged if it becomes necessary to check the validity of proxy signatures.

Using documents from the management office, the companies verify proxy signatures - a vital function, particularly in hotly contested elections in which abuse is possible.

Proxy re-encryption should not be confused with proxy signatures, which is a separate construction with a different purpose.

Proxy signature: A proxy signature allows a delegator to give partial signing rights to other parties called proxy signers.