As far as I know, there is no generally available and legal way to copy a netflix video, either from streaming download or from DVD. Regulations may vary country by country, but I'm pretty sure Canada and the UK and Australia are equally as strict, with, perhaps a few copyright differences.
Yes, if you have the (rare, early manufactured) equipment, there was a way to "copy" DVD's, from one source to another, but it is now pretty much unavailable, and DVD's have an intricate copy protection scheme which "locks" copying software out.
The best suggestion: go to a big box retail DVD outlet, or department store and look for cheap, older movies, (from the 90's to last year or so), selling at a huge discount, $1-$5 each. Buy a dozen or so. ALSO: Check with your local libaray for DVD's to borrow for up to 2 weeks or longer, to see if that is possible, most libraries limit DVD borrowing to a few days. Also, check with the library on the cruise ship, (yes, many ships have a small one, or some sort of "media" center, with a few dozen or more DVD's and music CD's to loan out, usually at a daily rental fee).
As to free WiFi, on a ship, almost non-existent. You are a captive on the ship, and they probably have limited WiFi/ Internet access via satellite, available for phones, some ship communication, and premium travelers. Check with the cruise before going. Some ships charge $10 a day for WiFi access to your computer, an added expense you may want to go without on a 7+ day cruise. If you are stopping somewhere on land for a full day or so, you may want to simply Google the WiFi cafe's at that destination, there are many of them in some but not all tourist towns these days, all over the world. You can also check to see if there is a public library in a destination port which might be just 3-5 blocks off the main tourist port street, where you can often times get free WiFi as well.
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