pages behind password

[sixis]

How to implement the folowing? Does someone have an idea?

A few pages should be password protected

At the moment i display a page content after comparing a password given by form with a text in the mysql database.
But the user has to fill in the password every time a new password protected content is viewed.

I think somewhere i have to save a state that this user has filled in the password correctly at viewing the first page
and then check the state for displaying the next page.

[dbs]

I'm not sure.
Create a group.
Assign some users to this group.
Go to the settings of a page and allow this group to view this page.
Maybe set the page to visibility "registered".

Only a idea.

[sixis]

sorry my fault,

not registered users

just visitors who know the password have acces without registering.

[dbs]

One page with login.
On this page are links to hidden subpages.
Could be a way.

[sixis]

Thank you for this splendid idea 

Due to the fact that the informations on these pages are not sensible (just hidden from curious) this is the right way.