There is no way to completely block others from your HTML code.
Some use a script to disable right click; however, I find that obnoxious because many extensions I use with Firefox have their menus in the right click context-menu. Disabling right click also doesn't prevent someone from seeing your code, because most browsers offer a "view source code" menu item.
You might be able to encrypt your meta keywords using entities like & # 913 would give you an Α and such.
But just think...how often would someone go through the trouble of looking at your HTML?
