It also says However, […], you hereby grant Twitpic a worldwide, non-exclusive, royalty-free, sublicenseable and transferable license to use, reproduce, distri

It also says However, […], you hereby grant Twitpic a worldwide, non-exclusive, royalty-free, sublicenseable and transferable license to use, reproduce, distribute, prepare derivative works of, display, and perform the Content in connection with the Service and Twitpic's (and its successors' and affiliates') business, […] I think the "sublicensable and transferable" part is relevant here. What I found most odd was the claim to go after unauthorized uses. I would've expected that this has to be done by the copyright owner in many countries.