How can I accomplish this (password to website, membership, physical product)...

Why don't you just monitor their logins and make sure they're not connecting from multiple ip addresses at the same time?

they could still share the site's address + visit it at different times (chances are they would not be visiting at the same time, any way)

You can use a PHP function to login onto each users account via 1 ip address

If you are interested i can build this function for you here and post it here.

If your members are giving away their password, they are short changing themselves .. however ..

1. log the IP
2. you can generate unique 'codes' either based on php microseconds ( then obfuscate the result ) or php guid ( generates a user ID like your windows product ID )
3. add you countdown to logins

If this is a physical book: About 14 years ago I had a client who produces their own version of the michelin guide ( for restaurants ) as a book for their subscribed members. I had never done anything in the form of pinting books ... however, I took on the task knowing anything was possible .. if you have the right tools. I learnt pagemaker and discovered you could create what was called a pagemaker tag file ... basically, its a standard text file but with its own version of tags .. similar to html ..

The pagemaker tag file took data from reps around australia .. which was then compiled into an online database of ( at the time ) over 30,000 records .. 63 possibilities of listing ( bold, red , underlined , colour pic or mono ) and 80 pieces of data for each entry.

One the 'go' button was pushed, the server which held the code and the website, 'built' the pagemaker tag file ... this was then imported into the template for the book layout ...

The result being, the book saved as a pagemaker file ready for print.
My point .. you can print these as a published book and have the individual code inserted as well .. you could even personalise them for the individual ... this can also be achieved through php pdf if you want to go that way ..
I hope that helps!

If you use S2member (wp plugin) it will log the number of visits from each member. It will (if set to) freeze accounts which are seen to use many different IPs.

You cannot set it to countdown limit on each page but you can set different membership levels which each type of member can have, meaning that for example "Platinum level" woudl have access to all pages whereas "Silver" may just have access to 25% of the pages (which you choose) on each page.

You can also set individual passwords for each page.

If you wanted to intergrate Paypal for any recurring membership fees you can also do this and s2member will monitor the subscriptions and set the accounts back to "free" "downgraded" or whatever if they skip payment

Hope this helps. If you need help with s2member plugin setup i am more than happy to give a few pointers.

DigitalAccessPass.com (DAP) has an IP-locking feature that will lock user's accounts if it gets used from more than "X" number of IP's (where "X" is configurable). And only admin can unlock the user again - so you'll know who is sharing their login info).

And while DAP doesn't have a "login countdown" feature, you can set finite expiration for your content at a PER USER level. So everyone gets their own access start and end days (or dates), after which the content will no longer be available to them (but will be available to others who are still eligible for it). So it's like a personalized content sequence.

- Ravi Jayagopal