#1
"This tablature contains content from a third party publisher and has
been blocked by the Music Publishers Association in your country."

does anyone know why I get this message when I try to view a tab? i get this in every song!!
#2
The Publishers who own the music had a hissy fit and threatened to sue UG if they didn't take the tab down.

Which is ridiculous because it's only an interpretation of the music, and if it happens to be right it's like guessing every question on Who Wants To Be A Millionaire whilst knowing none of the answers and having no one helping you cheat.
#3
Because they have been blocked by the Music Publishers Association in your country.

PSSSsSTT TS you can get by it with a proxy.
There's a good chance that what I've written above is useless and if you take any of the advice it's your own fault.
#4
Please consult the Site Feedback forum for more information on this. For some countries, certain tabs are indeed blocked, but UG is working on obtaining the necessary licenses so they can be displayed again.