Short Version:
Long Version:- If the browser can't parse/read the contents of the webpage, then no one will be able to see your webpages.
- If the browser can't parse/read the contents of the webpage but with a plug-in, then many users will leave your website without even bothering to install that plug-in.
- If the browser can parse/read the contents of the webpage using some sort of decryption algorithm, then you are only slowing down the process of viewing the source of your webpage NOT preventing it.
- If the browser can parse/read the contents of the webpage, then ALL visitors are able to view your webpage source.
Some old discussions about this issue can be found at:
If you really think that your webpage content is valuable then don't publish it on the internet.