Registration allows you to access many of the site content, rate and comment.
As stated in the Terms of Use, is crucial because the recording, the site features content that is covered by copyright, so it is important to protect these rights carefully.
The images at a low resolution, are directed to analyze, comment and let a judgment on the lighting technique applied on them, you must respect the rule of not download them.
Therefore, better a simple registration, to avoid improper use of the site content.
Thank you and good navigation, Alessandro.