Adobe PDF Functionality OEM Software

We are Looking to Develop a Software for PDF Files. Where we can use it on Mac & Windows . . Developer Responsibility is to design a Almost Same Functionality . as Adobe PDF Writer. It will hav Other Functionality like Approval . Comments Disapproved ... and will have Rest APis as well for Cloud Connectivity . I dea is to have a PDF Software with Editing and Reading Purpose and works on Cloud ... Also It does has a Functionality of Multi People Access So If file is Opened by 1 Person it should lock for other if the PDf Team Version is been Used. Source Code will be required. NDA will be Required.