Image Protection

V

Vanguard

Big Ed said:
How do I keep an image in an e-mail from being copied?
Click to expand...


Only if you never want the recipient to see it (but then you wouldn't
need to send it). As long as they can see it, they can copy it. As
soon as they see it, they could extract it, or save it, or use a screen
capture utility to take a snapshot of it. You're only protection is
copyright law (if it applies in your country).
 
B

Big Ed

Can digital signatures be protected?

Vanguard said:
Only if you never want the recipient to see it (but then you wouldn't
need to send it). As long as they can see it, they can copy it. As
soon as they see it, they could extract it, or save it, or use a screen
capture utility to take a snapshot of it. You're only protection is
copyright law (if it applies in your country).

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V

Vanguard

Big Ed said:
Can digital signatures be protected?
Click to expand...


Only half the key is included in a digital signature: the public key.
You keep the private key. You send the public key to someone, by
digitally signing a message, the recipient uses your public key to
encrypt their message they send back to you, no one intercepting the
message can decrypt it because they don't have the other half of the key
(the private one), and you decrypt their encrypted message using your
private key. So obviously you private key has to remain PRIVATE.

Thawte gives out freebie e-mail certificates but they are worthless
except for encryption. They don't include any verified information in
the certificate so they are worthless for identifying the sender -
unless you go through their Web Of Trust mechanism to get your personal
info inserted into your public key (which presumably are unique). Or
you get a cert from Verisign or some other cert authority and get your
info inserted when the cert is issued.

That still does not prevent misuse of your content. If you wanted to
send your e-mail encrypted to a recipient, you would first have to get
them to send you their public key, your encrypt your message, they
decrypt it, and then you lose control over the content because the
recipient can now do anything they want with that content, including
sending it someone else (without using your digital cert).

Once the recipient gets to see your content, you lose control
thereafter.
 
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