I am developing an app that makes use of the Google Books API. One of the features is to sort books by title. I am aware of the restrictions on keeping permanent copies of the data retrieved from any APIs as stated here - https://developers.google.com/terms/#e_prohibitions_on_content. However, is it possible to only keep the id as a reference to that object and the title for sorting. Keep in mind that to view any book details, I will still query the Google Books API.