[sbanach]

Uh, because with a drawn symbol you wouldn't need their thirty dollar notebooks?

[icebraining]

You'd still need the pages with the "special dotted paper pattern".

[tedunangst]

Does evernote not allow you to fix the page manually? (I don't use it.) The JotNot Pro app I bought for a dollar allows one to slide the corners around and reskews the image as appropriate, with some amount of auto detection as well.

[JabavuAdams]

No, stickers could serve that function. Google "registration marks"