Note taking at a device based on whether the user is a known user, unknown user, or owner

A computing device comprising:

• a processor;
• and
• a non-transitory computer-readable storage medium having stored thereon multiple instructions that, responsive to execution by the processor, cause the processor to perform acts including:
• receiving a first user request to input a note to the computing device from a collection of users using the computing device concurrently;
• determining, in response to the first user request, whether each user in the collection of users is a known user of the computing device or an unknown user of the computing device;
• receiving at the computing device, without unlocking the computing device and in response to determining that at least one user of the collection of users is a known user of the computing device, the note;
• storing the note;
• preventing, while the computing device is locked, other users of the computing device from accessing the note;
• receiving a second user request to edit the note;
• receiving an edit to the note only in response to determining that both the first user request and the second user request are received from a same collection of users;
• receiving an owner request to unlock the computing device;
• authenticating the owner;
• and
• presenting, in response to the owner request and authenticating the owner, the note.

A system comprising:

• a note input module, implemented at least in part in hardware, to receive a first user request to input a note;
• a user recognition module, implemented at least in part in hardware, to determine, in response to the first user request, whether the user is an owner of a computing device, a known user of the computing device, or an unknown user;
• the note input module being further to receive, without unlocking the computing device, the note in response to the user being the unknown user;
• an image capture device, implemented at least in part in hardware, to capture an image of the unknown user;
• the note input module being further to store the note and the image of the unknown user;
• a note access control module, implemented at least in part in hardware, to prevent, while the computing device is locked, other users of the computing device from accessing the note;
• a user authentication module, implemented at least in part in hardware, to receive an owner request to unlock the computing device and to authenticate the owner;
• and
• a note output module, implemented at least in part in hardware, to present, in response to authenticating the owner, the note and the image of the unknown user at the computing device.