I think their purpose is to stop anybody from reading/seeing the contents of a letter should that be showing through an envelope that has no security pattern. This would really only be an issue if you wrote a letter on both sides so when it came to folding it there would be writing on display. Envelope manufacturers playing on the fear factor! 🙂
What’s the purpose of envelope security patterns? I don’t see how they make the envelope more “secure”
I think their purpose is to stop anybody from reading/seeing the contents of a letter should that be showing through an envelope that has no security pattern. This would really only be an issue if you wrote a letter on both sides so when it came to folding it there would be writing on display. Envelope manufacturers playing on the fear factor! 🙂
Ah yes that makes sense. An obscuring feature.