I know you are here just because Microsoft has again changed its GUI for no other reason but eye candy. Its an old habit, anyways change is always for good but faces some resistance :p
The three simple steps to protect your document are :
1) Ofcourse jot up something which should be worth enuff to protect :p
2) Hit the Office button (conventionally known as File button – alt+f) and click on prepare
3) Hit Encrypt Document and you are done.
Isn’t that easy sparkyÂ :p
or you can use short keys, in the order
ALT+F, E, E