Encrypt and Decrypt can be performed by referring. You can unprotect or remove protection for a workbook as shown below. using ( ExcelEngine excelEngine = new ExcelEngine ()) Unprotect Workbook elements Press Alt + F11 to open the Visual Basic Editor. (it should be active when you run the code). You can do it by clicking on the file icon, it will open a list of options, select the info tab and click on the protect workbook. The Following code snippets illustrate how to achieve the above options. Open your Excel document and switch to the password-protected sheet. This can be set with or without requiring a password to open the file. Read - Only Recommended – If the excel file is set as Read-only recommended, then Microsoft Excel displays a message recommending that you open the workbook as read-only when users open the excel file.

Password to Modify - This password helps to allow give specific users permission to modify the workbook data and save changes to the file.

Password To Open - This password helps to protect your workbook from unauthorized viewing or accessing.

There are two different passwords to encrypt a document. To keep others from making structural changes to your documents such as moving, deleting and adding sheets, you can protect the workbook in the following ways.

You can protect an anonymous user from viewing, moving, editing or deleting important data from a worksheet or workbook by protecting a worksheet or workbook, with or without a password. Unprotect as owner: Select Review > Unprotect Sheet and enter the password. Security in Excel (XlsIO) Library (Excel Protected View)

Remove protected view excel