Upload documents safely with your own key into a SharePoint online storage
sDocument is a SharePoint add-in that you can upload files with your own key. It allows setting of password per document library. File contents are protected with 256 bit AES, which is high enough for most security requirements. It can be used for a simple archive solution or secure file transfer between third party or vendors.
Site version is available at https://www.strosecurity.com/sdocument-prices
Users manual is located at http://www.strosecurity.com/solutions/secured-archival-solution