My policy for the scripts at api.x2software.net is simple, and can be described by Wheaton's Law: don't be a dick. This goes either way.
As with all webservers, basic information about your request is stored in the log files. This includes the request time, URL and your IP address (if you think this is sensitive information, you'd better unplug your internet now). No other information is stored, nor is any information shared with third parties.
Please refer to the first paragraph. Usage of this service is free. If you generate more than a reasonable amount of load on this server, prepare to be blocked.