Subcriptions/membership sites, "global deals"

Hi people

I run a B2B content website with a subscription based business model, for a publishing company in London.

We launched our new portal a few days ago.

At the moment we allow 1 user login per account, but some of the bigger companies or universities who’ve been looking at our product, are interested in buying subscriptions to our portal on a company-wide basis, which would allow all their employees to access the site without having to log in individually.

I’ve been thinking about how this can be done. I have heard of IP identification based access, but not sure this is the best option because apparently it can easilly be hacked and could form a security risk.

Any help would be much appreciated!

Thanks in advance,

Elite Marriott
Digital Content Strategist, VRL