Premium account will allow to protect an expanded list of file formats.
Here are available file formats for a free account:
If you want to protect and send a file in unsupported format, you will see a pop up message.
Anyway, if you want you can send a message with an attachment of any unsupported format, but it will remain unprotected.
If you purchase a Premium account, you will get an extended list of file formats that can be protected and sent:
Please note all the files are converted to a special protected non-editable format after the protection.
After the expiry of the subscription period, you will be available to protect the file formats only from the basic list.
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