Whitepaper Document Management Application

Looking for a bid on a document management solution. We would like to start offering white papers and tech briefs and we would like to have people sign up to see them – offer a teaser then a login page. Probably we would like to maintain a simple profile for the user so they can login and view the papers when they like. The collected info would then need to be emailed to a contact here for inclusion into our CRM so the sales folks can run with it. Specifics: Documents would be primarily pdf maybe excel. Documents would be download only. Documents need to be secure, not encrypted but not downloadable by bypassing login/registration. Admin area for document upload/management. Document categories. Forgot password link. User created profile/registration collecting Name, company, email, phone etc. Account Activation function. Would need to fit into our site design.