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Please can anybody show me how to prevent other people convert pdf files to other formats? Such as Word, Excel, PowerPoint and so on.
Most of the time, when I was providing identity document as pdf format to organization, i would add watermark to it, such as " This [Name of the Documents] is dedicated for authenticating my identity in [organization]; I do not give My permission for any other use and also can not be copied " ......... in this case, does pdf have any features to delete its content within a period of time (such as 7 days, 15 days or 30 days. Can not be over 30 days)? Since I do not want organization to keep my Identity document forever, even if they promised to be deleted, I still do not trust them.
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There are two products that will let you both secure and expire a PDF after it's been distributed, Adobe LiveCycle ES Rights Management and FileOpen RightsManager. The first doesn't require a plugin, the second does.