There is no correlation between locking doors and breaking a user's software. HTML is not a protected document format. In other words, you should never expect to be able to keep someone from seeing your HTML or Javascript. In the case of Javascript, you can obscure the code so that it is extremely annoying to read (just look at any of Google's scripts). But you can't keep it hidden. Additionally, it is very simple to copy an image from the web browser; even if you can't "right click" the image. Simply take a screenshot of your browser and crop out the desired image. On a Mac it is even easier, you can select the region you want to copy.
Would you like to know how easy it is to pull down _all_ resources necessary to have a local copy of a website? Using wget, `wget -pkr http://example.com/`. There, I've downloaded all images, HTML, Javascript, etc. to have a local copy of exmaple.com. And I can browse it just like I would by navigating to the real site.
I understand that copyright on the web is difficult to keep track of. It is a valid concern. But breaking _my_ software because you think _I_ am a thief, well, that does not endear me to you or the information you want me to have.
I use the context menu (right click menu) to navigate backward in my browsing history. It is much quicker than mousing to the top left corner of my web browser.