OK I just looked at the files, they both have the scribbling stored as comments. Each distinct line is stored as a "free hand line".
So if you just touch the screen and you leave a small mark there that is stored as one comment.
see the attached picture
Continuing the idea about using this ereader by doctors and lawyers for editing and signing docs...it is not a good idea, the docs can be modified after they were released.
You need a better PDF editor implementation for that and I think it is out of scope for now.
Last edited by PF4Mobile; 12-16-2011 at 01:48 PM.