First of all, "Blackjack" is now just a brand. The original company by that name went bankrupt albout twenty years ago, and the brand was purchased out of the bankruptcy by someone formerly totally unrelated to Blackjack the company, Ken Warner. Not sure who owns the brand now, but Ken Warner is a giant in the knife world, a member of the Blade Hall of Fame.
The Blackjack Model 1-7 and Randall Model 1 have been compared here several times.
http://www.bladeforums.com/threads/randall-and-blackjack-1-7-observations.675436/
They are similar, not identical. The Blackjack 1-7 is not a copy or clone. While it seems fair to argue that the BJ was based on or meant to suggest the Randall ("style"), no Randall collector would mistake the one for the other. I doubt that very many here, ranters aside, would place them side-by-side and say they were the same design - unless you are trying to leverage on the Randall mystique to sell your BJ. Different thickness, grind, handle, guard, steel - you know, all those nagging details.
Second, Blackjack was built in 1987 on selling knives made my this guy Reeve which were, at the time, made in South Africa and imported into the U.S. If you have a problem with Reeve's fixed-blade knives, take it up with him or whoever runs things now.
Then Blackjack imported knives from Japan.
The first U.S.-made Blackjacks were made after 1990.
The Model 1-7 was one of many Blackjack models, most of which bear no resemblance to anything Randall ever made. But you would only know that if you were informed about the topic. Anyone without an axe to grind can Google "blackjack" plus any of the following and see if they look Randall to you: Blackmoor; Highland Dirk; Tartan Dirks; Anaconda; Marauder; Viking Raider Axe; Mamba; Warner-Moran Bowie; Safari Classic; Loveless Warner; mini-mamba; Jaeger; Tracker; Halo; ZFM III; Kukri; wasp.
Later, Blackjack, the company, bought the "Ek" brand and made several models of Ek-like daggers and bowies and other knives Ek never imagined but bearing the Ek brand.
And patents or trademarks apply to features of knives, not copyrights. Patents are not eternal. If the Randal Model 1 was patentable, which seems unlikely, and was patented, which is not in evidence, the patent expired generations ago.
God forbid that mere reality should get in the way of a good rant.