This kind of pisses me off, because they do NOT have the rights to restrict access to my image like this, especially when they make it a subscription access thing. Whilst I choose not to use the NC (Non Commercial) aspect of the Creative Commons licensing system – which mean that people can indeed make money from using my photos if they wish – the SA (Share Alike) component means that they must publish under the same licence as they got it. In practical terms, this does effectively mean that my photos cannot be used commercially, since anyone using them has to make them freely available in the same way that I did. But what they are definitely not allowed to do is to restrict others from using them in any way, including watermarks or paywalls. I see this as a clear breach of the terms of my Creative Commons licence.