Actually, if you read Google Drive T&Cs is quite clearly states "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."
In contrast, Dropbox states they own nothing you put into Dropbox and have NO right over it. "You retain full ownership to your stuff. We dont claim any ownership to any of it."
Below are some links that might take your interest:
http://www.google.com/policies/terms/
https://www.dropbox.com/dmca#terms
http://www.zdnet.com/blog/btl/how-far-do-google-drives-terms-go-in-owning-your-files/75228
Consider yourself wrong.