The last i checked, you cannot copyright a language. HTML/PHP is a coding language. You also cannot copyright the format of of the mod. IE the end result, etc.
In reality, this is just a VB rule to allow coders rights to their mod. I agree with the "dead mod" rule which would allow someone else to take over the mod when the user has not updated it within a year period.
I was having a hard time find supporting laws that Marco stated. In fact, i did not find any copyright laws that mention copyrights on coding and scripting language. I also could not find specific coding such as PHP/HTML/etc categorized as "art." Marco please post references when making statements regarding international law.
From the U.S. Copyright law -
"(b) In no case does copyright protection for an original work of authorship extend to any idea, procedure, process, system, method of operation, concept, principle, or discovery, regardless of the form in which it is described, explained, illustrated, or embodied in such work"
http://www.copyright.gov/title17/
http://www.copyright.gov/title17/92chap1.html#101
http://www.rpi.edu/dept/llc/webclass...p5/format.html