Don't save history as plaintext

It would be nice if clipboard history wasn't saved to a text file in plaintext. Sometimes sensitive data is copied (sometimes critical, sometimes not but still sensitive).

One simple way to do this would just be to encode them when writing to the text file, then decode them for the systray and "show full history" menus. Or something like base64encode then shift a character. This isn't secure but it at least obfuscates them and wouldn't leave readable info in a text file written to disk.

A more secure way (and more complicated) would be adding an option to encrypt them and asking for a password/pin/etc to unencrypt them in the systray menu and history menu.