Creative Commons and "The" Public Domain

This diagram shows how items posted online work within the abstract notion of copyrights. In general there appears to be a lot of confusion as to what exactly constitutes a "commons" and I aim here to address the notion that public visibility inherently makes something a part of a "commons".

It is a grand idea for sure. But if we examine the idea of open source by its available licenses we will note a spirit of choice allowed by these licenses. These choices give creators a measure of control over their works while still allowing for creative re-use. However this doesn't mean such works meet the qualifications of "public domain".

The CC licenses allow a creator to prevent, (or place restrictions on,) the commercial re-use. As I understand public domain works are works with no restriction.

Of note is the fact that "comments", from either members or non-members, are always treated with a traditional copyright. The website team: owner,web-master, and mods, generate their own standards regarding the "publishing" of these comments.

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This chart represents the logic behind my prior comments relating the design of the web to a well structured anti-commons.