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when youamp;#39;re sending off your presentations and people are asking if this presentation is really from you you may want to consider getting a digital signature because it will confirm the identity of the person who sent the presentation and theyamp;#39;re typically issued by a certification authority or CA a trusted third party and in it itamp;#39;ll contain a serial number digital signature of issuing authority expiration dates and the name and copy of the certificate holders public key so the user can verify that the certificate is authentic so once the signature is attached to a document or in this case this PowerPoint presentation it canamp;#39;t be modified without first removing the digital signature and anybody can remove it okay whatamp;#39;s the purpose of doing it well itamp;#39;s not like a password protect itamp;#39;s a way to verify that itamp;#39;s from you that you created it that when you send it off to the person is from you and it hasnamp;#39;t been tamp