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Hello Hope you are doing well. I have 6 years of experience in Digital marketing and development in different languages. Well my main focus is to maintain long term relationship with quality work. Connect with us will help you till long time support on your software and business Let's come on chat and discuss more on the requirements looking to hear positive reply from you

PDF files are images once opened they could be shared and if you want to share files without leak best way is to build a custom app and share them there and block screenshots so they wont be able to screenshot and share. Its better to put a share button in the app but with a pop up, when person X shares it asks the owner of the file : person alex asked to share documents with morgan etc —- I have done some data encryption and data security projects. this one is try and find out projects.. I want to know more details and information chat with me so we could discuss more.

There are multiple ways to do this. But need to understand your requirements first like what would be mode of transfer of files. It is impossible to stop sharing of files. But we can create a pull based solutiion rather than seding files, where your customer's will pull a file from a web server (rather than sending them via email). We can create a mechanism where the files can be pulled only specific machines. The document can be kept accessible via web only, so that it cannot be downloaded (and subsequently shared). I work in the field of APIs and can suggest an API based solution after understanding your requirements. It can also be achieved via a mobile application based approach but I am no expert in it.