The best replacement for passkey is anydvd.

The best alternatives to passkey are rated as following:
★★★★★  anydvd
★★★★  passlock
★★★★  anydvd hd
★  pin
★  passphrase

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Speaking about passkey, one probably shouldn't forget about bluetooth.

Other search terms related to passkey and their ratings are:
★★★★★ bluetooth
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passkey
anydvd
passlock