New online download services supply movies on demand that you can keep.

First came legal music downloads. Then, last fall, Apple’s iTunes Music Store unleashed download-to-own television shows for portable devices. Now, the two leading Web-based movie services–Movielink and CinemaNow–offer digital movies for purchase.

Both Movielink and CinemaNow launched the new services earlier this week. Previously, both services focused on online rentals, letting customers download a movie for a limited rental period. The movies available ranged from catalog titles to recent releases.

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