[xwiki-users] permissions/rights for printing

Hi, We decided to write an online book by using xWiki as the authoring system. While we want to make it freely available, we'd like to restrict pdf and other printable output apart from plain html. (we might want to sell pdf outputs later, with watermarks, but that would be a different story - and we will probably go via Latex then). But current permissions seem only to make a distinction between view(including html, pdf, rtf, xml, ...) and edit. How would we go to add such a "print" right, and even differentiate pdf and .xar and other there? Thanks in advance, Henning -- Henning Sprang http://www.sprang.de | http://lazyb0y.blogspot.com/