If you disable text selection on your blog then nobody can copy your content. So, to disable text selection. Follow the following steps.
Step 1: Goto your blogger and click on Layout Menu from the left.
Step 2: Click on Add Gadget from the layout. (You can add it anywhere on sidebar, footer etc.)
Step 4: Put anything in title and copy the following script and paste it into content. Finally save it.
Now, Text Selection will be disable in your blog and no one can copy your content.