Ethical issue here, but you should probably get the permission of whoever you’re recording, such as your professor, who may have explicit policies about whether it’s allowed without specific prescribed accessibility accommodations. 

Are there services or products that function like the Molskine/Evernote team-up that let you take pictures of documents and then search the text in them once they’re uploaded? I do a lot of really good thinking in handwritten form, and while once that initial thinking stage is done it would be nice to have it…