I have a TinyMCE widget that is limited to only <p> tags and non-block-level elements. Thus, the user is unable to insert tags like <div> or <table>. Which is the desired behavior.
However, the user can copy any content from any web page and paste it to TinyMCE. Is there a way to prevent pasting there, or better yet, limit paste to only a set of tags?
Have a look at the paste plugin shipped with TinyMCE.