Overview of SecretFolder's Key Features
When you launch SecretFolder for the first time, a password setup window like the one below will appear, and you must enter a password before you can use the program.
After setting a password and launching SecretFolder, you will see buttons like the ones below.
Add - Adds the folder you want to hide.
Remove - Removes a previously added folder. ( The folder itself is not deleted; it is only removed from the list. )
Lock - Hides the folder added through the Add button.
Unlock - Makes a folder hidden through the Add or Lock button visible again.
Preferences - Opens the window where you can configure the main settings.
About - Opens the program information window.
Now let's look at how to hide a folder and restore it again.
First, to hide a folder, click the "Add" button.
When the Browse for Folder window appears, "select the folder you want to hide" and click the "OK" button.
You will then see that it has been added to the list as shown below, and the folder will be changed to a hidden state.

To remove a folder from the list, click the "Remove" button.

Clicking the "Yes" button will remove it from the list, but the actual folder will not be deleted.
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Differences in the Paid Version of oCam and How to Register the Serial Number
This software is free for non-commercial personal use, so businesses and users using it for commercial purposes must purchase a license.
If you use it in a company, organization, public institution, educational institution, or PC cafe, please purchase a license before use.
There is no difference in functionality between the free and paid versions. All ads shown in the free version are removed in the paid version.
Of course, non-commercial individual users may also purchase it if they want to remove the ads.
After purchase, the serial number will be sent to you by email, and you can use the software after registering it as shown below.
[How to Apply the Serial Number]

As shown above, click the menu and select Register, then enter your email address and serial number and click OK. Authentication will proceed as shown below.

After a short wait, the registration will be completed successfully.

[Registered oCam Licensed Version]

This is the registered screen with the ads removed.
For reference, the ads that opened when exiting the free version are also removed in the paid version.