Subscriber Content License to Tumblr: When you transfer Subscriber Content to Tumblr through the Services, you give Tumblr a non-exclusive, worldwide, royalty-free, sublicensable, transferable right and license to use, host, store, cache, reproduce, publish, display (publicly or otherwise), perform (publicly or otherwise), distribute, transmit, modify, adapt (including, without limitation, in order to conform it to the requirements of any networks, devices, services, or media through which the Services are available), and create derivative works of (including, without limitation, by Reblogging, as defined below), such Subscriber Content. The rights you grant in this license are for the limited purpose of operating the Services in accordance with their functionality, improving the Services, and allowing Tumblr to develop new Services. The reference in this license to “derivative works” is not intended to give Tumblr itself a right to make substantive editorial changes or derivations, but does enable Tumblr Subscribers to redistribute Subscriber Content from one Tumblr blog to another in a manner that allows Subscribers to, e.g., add their own text or other Content before or after your Subscriber Content (“Reblogging”).
When you upload your creations to Tumblr, you grant us a license to make that content available in the ways you’d expect from using our services (for example, via your blog, RSS, the Tumblr Dashboard, etc.). We never want to do anything with your content that surprises you.
Something else worth noting: Countless Tumblr blogs have gone on to spawn books, films, albums, brands, and more. We’re thrilled to offer our support as a platform for our creators, and we’d never claim to be entitled to royalties or reimbursement for the success of what you’ve created. It’s your work, and we’re proud to be a part (however small) of what you accomplish.
You also agree that this license includes the right for Tumblr to make all publicly-posted Content available to third parties selected by Tumblr, so that those third parties can distribute and/or analyze such Content on other media and services.
An example of what it means to “make all publicly-posted Content available” to a Tumblr partner for distribution or analysis would be if we licensed a feed of already-publicly-available Content to a partner, similar to how Twitter makes feeds available through its Streaming API.
Note also that this license to your Subscriber Content continues even if you stop using the Services, primarily because of the social nature of Content shared through the Services - when you post something publicly, others may choose to comment on it, making your Content part of a social conversation that cannot later be erased without retroactively censoring the speech of others.
One thing you should consider before posting: When you make something publicly available on the Internet, it becomes practically impossible to take down all copies of it.
You also agree that you will respect the intellectual property rights of others, and represent that you have all of the necessary rights to grant us this license for all Subscriber Content you submit to the Services.
Content License to You: As a Subscriber of the Services, Tumblr grants you a worldwide, non-exclusive, non-sublicensable, and non-transferable license to download, store, view, display, perform, redistribute, and create derivative works of Content solely in connection with your use of, and in accordance with the functionality and restrictions of, the Services (including, without limitation, Paid Services, as defined below). This means, for example, that we license Content to you so that you can Reblog Content and add commentary to it.