Help on e-library system?

[PHPycho]

our team is going to make an e-library system..
which has three sections "seller", "buyer" and "admin"
I have not much idea about e-library.....
Please help me on the below topic
>e-library references
>neccessay database tables( with fields)
>security measures must be taken into consideration in e-library

You guys had helped me alot ..hope the same great help from You...
Well thanks in advance

[paulyG]

Can you explain further what an e-library is and how it works?

[PHPycho]

I mean to say that e-library or e-books in our case is nothing but a cms which has three sections user/buyer, seller, admin...
user/buyer can browse books or can buy books
seller can add/edit/delete books and he can also sell his books
admin can control over the user, seller ......
What i want is
>e-library references
>neccessay database tables( with fields)
>security measures must be taken into consideration in e-library

You guys had helped me alot ..hope the same great help from You...
Well thanks in advance

[paulyG]

Sounds more like a shop than a cms.

If it we me I would try freshmeat.net and sourceforge.net and search for shop and cms and see what it comes up with. I'd download and investigate the most promising and see how they set up their databases/scripts.