sony pictures tried to keep me out of the data i bought for them in the form of movie cassettes unless i bought their betamax player. Then they tried to take the data i bought from them unless i bought i laserdisc player. Then they realized they couldn't not bait me because dvds were smaller, so they tried with something smaller than dvs, but i was too smart to fall for minidisc. Then they tried with a mp3 player named after their old walkman that only played their format and was not a usb mass storage like all the others (what do they take me for? an apple customer? insulting). Later they tried with blueray. and this time they at least sold licenses for players from other brands and are managing to keep lots of other people away from their media.
now only if the hackers would hack my betamaxes and laserdiscs i bought from sony pictures and release it for me.