In Web Page doing all this is waste of time. Even you do it still user can copy.
1. Since JavaScript will be used to disable keys it is quite easy to disable JavaScript
2. User can do View Source and copy content.
3. User can also save your web page using browser as HTM document
4. User can capture a screenshot.
Thus ignore this, there is nothing you can do to stop copying. And if you are so much concerned, Copyright your content