Tablature copyright is generally owned by a publishing company, often protecting rights to tab books. Read up on the history of the OnLine Guitar Archive [1] (OLGA), one of the first internet copyright fights I became aware of a couple of years after I got online. Despite the fact that these were user created and shared tabs, often of middling quality, EMI felt they owned copyright and pursued various incarnations of the archive for years. The current crop of ugly, SEO spammed offshore tab and ringtone sites are the result instead of beautiful tools to learn music like Soundslice. Unless the creator has made agreements for publishing rights I'm afraid this great resource is going the way of so many before it while these copyright dinosaurs guard their last remaining treasure.

[1]http://en.wikipedia.org/wiki/On-line_Guitar_Archive