This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
As already mentioned there is nothing you can do to protect your images, document, clientside code, etc. All of the code is saved to your computer as soon as you load it the first time. All of the files are saved in the temp. internet files folder.