Microsoft's How-Old.Net app has gone viral since it was released at the company's Microsoft Build conference last week.



But Fast Company reports that the app, which allows users to upload photos of people and have Microsoft’s systems analyze them and guess their age, comes with fine-print that may not be to everyone's liking.



The uploaded photos are subject to the terms of Microsoft’s cloud computing platform, which the app accesses to work, and those terms give Microsoft the right to use the pictures across all of its Internet businesses – and to use your name into the bargain.



Specifically, the Terms of Use specify that, by uploading a photo, the user is granting Microsoft and its affiliates "permission to use your Submission in connection with the operation of their Internet businesses including, without limitation, the license rights to copy, distribute, transmit, publicly display, publicly perform" as well as to "publish your name and to sublicense such rights to any supplier of the Website Services."



So, if you have used – or intend to use – How-Old.Net, don't be surprised if someday you see your face and name gracing a Microsoft ad.

