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Originally Posted by Berenburger
It protects against forwarding to third parties and against copying and unauthorized use of the attachments.
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Quoting from the sfletter's documentation again:
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If you choose "Protect the attachments", the text of the email message will be displayed as an ordinary message, and a recipient needs to install StarForce reader to open the received attachments. An instruction about how a recipient can open a protected document will be placed in the attachment [...] Linux users will not be able to open a protected document, but it will remain protected. In this case, we recommend you to use Wine or other systems to work with Windows-based applications.
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This, plus the restriction on the systems where one can read messages, makes it too messy for an ordinary user.
There is a borderline between usability and security, and to my mind, sfletter has gone much too far towards overprotection. Of course your requirements may differ.