Joined the EFF using paypal today with the "DMCA" listed as the reason. (thanks for the reminder in someone elses diary, I had been meaning to do that).

Also sent a suggestion to paypal: I would like a way to show proof of payment to third parties. (so that Alice can prove to prove to Cathy that she paid Bob).

It could be done either requiring Cathy to be a paypal user (they would like that I'm sure) or alternatively to anyone not even being a user by making the page a "one-shot" that after the viewer clicks a "confirm that i have read the proof" button it goes away [so that one proof couldn't be used multiple times].

I suggested it for the purpose of selling items saying "proceeds will be donated to the EFF" (or charity of choice that accepts paypal). That way buyers could be sent proof of the truth in that statement.

The alternative "fun" use would be for thugs to get proof from you that you made your weekly blackmail payment to the thug's boss.