Is it legal to post pictures from an official movie website onto a blog?

I'm writing a story about the Dark Knight for a marketing agency's blog and need to find out if I can use pictures directly from the Dark Knight website.

For my own site I wouldn't care, but they are worried about legal issues.

It depends on their copyright policy. If they allow to use it freely, it would be clearly stated in their copyright policy.

However, most of us are too lazy to read the whole document right? In instances like that, I use a creative commons search, such as the one described here: http://www.rockfuse.com/blog/how-to-get-free-images-for-your-blog-posts-legally-in-a-few-seconds, to get free images legally.