You can password protect your public kits, adding an additional layer of security to your sharing. Password protection is only available on Lingo's Enterprise plan.
Open the Kit you want to password protect and click the "Share kit" button in the upper right. Then, in the modal that appears click the "Enable public access" option.
If you're an Enterprise customer, you will see the "Require a password" checkbox when you make your Kit public. Simply check the box and enter a password to enable password protection.