Visual secrecy: viewing angles et des autres animaux

Here are some ideas how you can prevent other people from reading your notes as you write them:

• Write your notes in 3D, so that only people with appropriate 3D visors will be able to read.
• Wear data visors that leave part of your visual field free to follow the lecturer; have your notes transmitted encrypted to the visor.
  
• Use a laptop with very limited viewing angles.

Feel free to implement any of the former two and let me know when you succeed!