Those sites use javascript to disable the right click menu.
However, as I stated the content is already in the computers browser cache files.
( temporary internet files )
As for protecting an encryption key, you don't need to.
If it's your public key, it's only useful on your computer,
assuming it's your computer that created the "key pair."
Remember, people use your "public" key to encrypt files and mail to send to you.
Anything encrypted with your "public" key can only be decrypted on your machine
with the key ring that contains your private key.
fwiw, I dabble in Gnupg and pgp.
--
Steve Easton
Microsoft MVP FrontPage
95isalive
This site is best viewed............
........................with a computer