I have a paper with an equation in the title, and I would like to include the equals sign in the pdf metadata by using the hyperref key "pdftitle", by including it as in the following:

\hypersetup{pdftitle={P = NP}}


But when I typeset this, the metadata stops just after the P.

So my question is, how can I get the symbol = to appear in the pdf metadata with hyperref?
I'm using TeX+DVI, in case that matters.

After Ulrike kindly pointed out the there was no problem. I tried to just restart to see if the problem evaproated... and it did! I'll leave this up in case someone else has something similar happen.

\documentclass{article}