When something is "limited", it means that you can't get a lot of it. For example:

Money is limited these days.

This means that you don't have much money.

"Limited access to ___" means that you aren't able to see or use something very much:

The money is going to help families who have limited access to safe drinking water and medical care.

At my work, we only have limited access to the Internet. They block a lot of sites that don't have a clear business purpose.