Yes. The Trial version is limited to 20 indexed tasks and 20 indexed documents.
The two-key mechanism allows you to cancel the purchase in case of a refund request.
In Keepmark you can configure default author for new notes. It can be helpful, when you want to discover if note is created by you, or copied from external source. This operation you can do in Application Settings.
Keepmark can store any files that are on your computer. Moreover, it previews many popular document formats, allowing you to view them without having to open them in a dedicated application.
See attached video to see how to use Tasks Module in Keepmak.
There is no limit for number of devices to run Keepmark for a single license.
No. Currently Keepmark is a desktop application. However, documents are stored in a user-accessible form and can be synchronized with mobile devices, e.g., using services like Drobox or the WebDav protocol.
Currently, the sales process is handled by FastSpring company.
See attached video to see how to configure email account in Keepmark.
Currently Keepmark has no support for OCR (recognizing text from image files). However, it is not excluded that this possibility will appear one day.