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|One copy of the
document (the master copy) must be unambiguously correct, so reference can
be made to it if there is any dispute about the accuracy of a copy, or about
an amendment that has been made.
In a paper-based system of document control, this is a hard copy, with is distinguishable from the authorised copies, perhaps because it is on a different type of paper.
Alternatively, an electronic version of a document can serve as a master copy, provided that it is appropriately protected from unauthorised alteration.
Each document, when issued or revised, must be authorised by somebody with the authority to do so.
On a hard copy, the evidence of this authorisation is usually the personís signature.
Authorisation through a computer is also acceptable, provided that the system prevents unauthorised people from performing the authorisation.