Abstract: Methods, systems, tools and computer program products are provided that enable a document revision management system to utilize lockless collaboration such that a plurality of users can edit a plurality of document versions concurrently. The system uses a directed acyclic graph to store information concerning ancestry of versions of related documents and to track revisions between parent and children versions. The system provides users the ability to save versions as private or published and to apply security parameters so that only certain users or groups of users may see specific revisions and/or versions. The system can redact portions of the revision history for non-authorized users. Automated publication notifications can be distributed by the system to document moderators to update them of available changes to documents. The system allows for automated merging of non-conflicting changes as well as moderated merging when human interaction is desired and/or required.