So I've been tasked to start doing some research on how we can publish a scholarly research-based quarterly, and instead of releasing it in print for sale, creating or adopting a model for PDF distribution for up to 3000 people that can generate income. I'm aware that PDFs have a number of security features that can be enabled but I'm just wondering if anyone has any experience of producing this type of product or receiving PDFs that you've paid for? Distribution, cost scales and DRM are the probably the most immediate issues that come to mind. Any insights, links, issues I'm unaware of... all appreciated. Thanks in advance.