Heres a little snippet from C-registry's terms of use you have to agree to if you sing up...interesting to say the least..
YOU grant The COPYRIGHT REGISTRY:
For the purpose of globally and universally distributing INFORMATION in the broadest, most unlimited means possible,
A nonexclusive, royalty-free, perpetual, irrevocable, and fully sublicensable right to use, reproduce, modify, adapt, publish, translate, create derivative works from, distribute, and display INFORMATION throughout the world in any and all media without limitation, and
For the purpose of providing global and universal ACCESS to view your CONTENT in digital form,
A nonexclusive, royalty-free, perpetual, irrevocable, and fully sublicensable right to access, view, host, cache, route, transmit, store, perform and/or display CONTENT, and
For the purpose of including your CONTENT in reports and documents issued by The COPYRIGHT REGISTRY that relate to Digital Millennium Copyright Act Take Down orders, copyright ownership and authorship of CONTENT, conflicts of ownership and authorship as stated in the Website, and other printed and digital forms relating to INFORMATION,
A nonexclusive, royalty-free, perpetual, irrevocable, and fully sublicensable right to cache, use, reproduce, copy, resize, crop and/or publish CONTENT, and
For the purpose of enabling YOU and users to embed VERIPIXEL in CONTENT to announce that CONTENT is copyrighted and to enable use of The COPYRIGHT REGISTRY to identify the claimed righterholder(s) for said CONTENT,
A nonexclusive, royalty-free, perpetual, irrevocable, and fully sublicensable right to copy, modify, adapt and distribute CONTENT for the sole purpose of embedding VERIPIXEL in said CONTENT, and
For all purposes,