The links of your collections are random and unguessable.
We are using that instead of password since it's easier for you and your clients. You don't need to find and share a password and it's as safe as password system.
Besides, the high resolution photos stay on your computer, only the small resolution (1000px biggest side) are uploaded to our secured servers.
Moreover, you can automatically watermark your photos. To do that's, go to the publish service settings (double click on Evlaa under publish services panel):