It's free, easy to use (even for beginners), compatible with all major web browsers - perfect camera freezing tool!! I have used it in couple of meetings where my boss forgot his smartphone at home or lost memory cards after long work hours without getting back any information from clients / colleagues etc., thus no way possible to take screenshots so this "free" application helped me out when needed most by providing clear proof which could be easily shared via messenger/Skype while keeping privacy intact since there are NO SCREENSHOTS taken. Just make sure YOU ARE IN A PUBLIC PLACE before using such apps otherwise people can see what they want them too as well. Have absolutely nothing against its usage if you really need something like this but try first yourself how much time do you save compared to taking screenshot manually :).