Just like every thread claims he traveled to Pakistan when it was prohibited for Americans to travel there (travel was not prohibited). If you repeat something so many times people will accept it as the truth and say "it must be true because I've read about it so many times on the internet!"
In this case, the argument goes something like this: Routine motions to dismiss have been filed on Obama's behalf. Lawyers are expensive. Therefore, Obama must have spent hundreds of thousands (sometimes millions) of dollars fighting to keep his birth certificate sealed (something the State of Hawaii does for free in accordance with state law).
Americans were not prohibited by the US from going to Pakistan, it is just that at that time visas to Americans were not being granted by Pakistan.
The chief reason his BC* from HI would be sealed is that he was legally adopted by Lolo Soetoro when Mama Stanley Dunham married the fellow.
* If indeed there is one. This fellow is a very slippery character, note please, that on his Illinois Bar Registration, he claims to have never been known by another name. This is very weird.