Password locking is inherited from the compound block in the source file. In other words, you do not apply protection to the embed block itself, but rather to the compound block in the source file.
To protect an embedded block diagram
1. Open the source file that contains the compound block to be protected.
2. CTRL+right-click the compound block, or choose Edit > Block Properties and click the block.
3. Activate Locked and enter a password in the Password box.
4. A password can contain up to 10 characters and can include any combination of letters and numbers. Embed echoes an asterisk (*) for each character you type. Passwords are case sensitive.
5. If you do not enter a password, a user can subsequently unlock the embed block.
6. Click OK, or press ENTER.
7. Embed asks you to re-enter the password for verification.