In a nutshell, if you use Google Drive, you give Google the right to use your content in anyway they see fit – including giving it to partners.
It effectively shreds any implicit privacy you might otherwise expect from a commercial online service.
Read it yourself – and take a look at the policy for Skydrive, Microsoft’s cloud storage service, in comparison:
- “When you upload or otherwise submit content to our Services, YOU GIVE GOOGLE (and those we work with) a worldwide license to use, host, store, reproduce, modify, create derivative works (such as… those resulting from translations, adaptations or other changes we make so that your content works better with our Services), communicate, publish, publicly perform, publicly display and distribute such content.”
- “You understand that Microsoft may need, and you hereby grant Microsoft the right, to use, modify, adapt, reproduce, distribute, and display content posted on the service SOLELY TO THE EXTENT NECESSARY TO PROVIDE THE SERVICE.”