Add-in for Microsoft PowerPoint for Tracking Changes Funcionality

As in Microsoft Word \"Track Changes\" functionality, I need a development for an Add-In for tracking changes in Microsoft PowerPoint. Currently Microsoft PowerPoint lacks of this functionality. Please review Microsoft Word \"Track Changes\" functionality to work in a similar functionality but for Microsoft Powerpoint. Here I include a video link so you can review the functionality: [login to view URL] I need just the same functionality as in Track Changes from Microsoft Word. The original code is needed once developement is finished. To prevent users to share and copy the file from one computer to other without paying It is needed to generate one dll file in system 32 so when the user install it and once the file generate the micros, can not be used again, so after that the user have to contact me if they need to use it again.