Startup Ideas: Reinventing CVS for Business

The need for joint creation and coding of knowledge has long ceased to be the prerogative of programmers. More precisely, so. Everyone who encodes knowledge, stitches them in any form, this is a programmer. But for some reason, the advantages and joys of versioned file repositories are available only to “programmers,” that is, IT people in the narrow sense of the word.

Plus, with the ever increasing standardization of file formats and the increasing distribution of XML formats, the ability to compare versions will be more and more common. The ability to compare documents is already in Microsoft Word, for example.

So, the task. Create the ability to work on one document (or group of documents) to a distributed team. In fact, expanding SVN or CVS for the needs of businesses, not just programmers.
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Additional requirements:
Advanced Access Management
Web access without using a local file system
Storage of meta-data about files: tags, tags, associations
Automatic backup storage

I know several types of businesses where this solution will be used. This is a company
consultants, law offices, design bureaus. Where there are many different files, and access to them is needed not only by one person.

The solution scheme is obvious:

The first to solve this problem will get a prize in the form of a local temporary monopoly in the market. It is desirable to "solve" immediately with the question of comparing versions for all major formats. And not only at the level of rights. That is, it will cover as large an area as possible from right to left.

Or maybe someone knows a ready-made platform for this?
Is someone using Sharepoint? Can you tell us how it works for you?