Federico Leva (Nemo), 30/08/2015 09:38:
Note that Google terms of use are very restrictive.
It seems the Google Drive API doesn't have specific terms of use, only the generic ones at https://developers.google.com/terms/ Relevant passages may be:
5e. Prohibitions on Content
Unless expressly permitted by the content owner or by applicable law, you will not, and will not permit your end users or others acting on your behalf to, do the following with content returned from the APIs:
Scrape, build databases, or otherwise create permanent copies of such content, or keep cached copies longer than permitted by the cache header;
[...]
8b. Your Obligations Post-Termination
Upon any termination of the Terms or discontinuation of your access to an API, you will immediately stop using the API, cease all use of the Google Brand Features, and delete any cached or stored content that was permitted by the cache header under Section 5.