Anyone with this password (and the direct link) can view this document. It won't appear in the public list. You can add more passwords for other recipients after uploading.

Naming this password to one specific person is the safer default: they won't be asked to self-report, and the log/watermark always trace back to this name reliably. Leave it blank only if this password is meant to be shared with a group; a self-reported name at unlock can't be verified and is easier for someone to leak under a fake identity.