Picasa oferuje 3 poziomy dostepnosci albumow, w tym haslowanie
albumow.
>
> TA

Pomimo szczerych wysiłków nie mogę nigdzie doczytać o tym haśle.
Nie chce aby oglądający byli zmuszani do zakładania konta na google.
W opcji private :
Users without a Google Account will be prompted to create one

http://picasa.google.com/support/bin/answer.py?hl=en
&answer=39551

Public on the web

Set your album visibility to 'Public on the web' to make them viewable
to anyone who knows the URL of your Public Gallery. Your public albums
may also appear in public search. Learn more about public search

Anyone with the link icon Anyone with the link

Set your album to 'Anyone with the link' to limit who can see it.
Albums shared with anyone with the link include a unique authorization
key in the web address; the key is a combination of letters and
numbers that make the address difficult to guess.

Private icon Private

Select the 'Private' option to set the highest level of privacy for
your album -- you specify exactly who has permission to view private
albums, and those viewers must sign in to their Google Accounts to
verify their identities. Users without a Google Account will be
prompted to create one. Anyone not included on the album's "Shared
with" access list will be unable to view the album.