PS3's video store, one of them is the fact that, should you want to free up HDD space by deleting a video and then attempt to download it again later, you'll quickly find yourself on the phone with a Sony customer service representative. (Plus, you might actually have to get up to call them – ouch!)
Oh, the rep will happily flip a switch somewhere enabling you to re-download the video in question ... but only once. Make the same mistake twice and you're stuck. In this case, whether you actually "own" what you've paid for is more than a little fuzzy.
Of course, you could take advantage of one of the PS3's nicer features and simply install a larger off-the-shelf hard disk by yourself. And, since Sony's been so kind as to provide a PS3 Backup Utility for migrating your data, those videos will transfer right over ... right? Not so fast. According to the utility's documentation, purchased and rented PSN video store content may not play following the transfer process. In this case, you'd better hope you haven't used that one-off "lifeline" call to customer service yet.
Source – PS3 re-download limits
Source – Sony PS3 Backup Utility