Spyderco is the innovator, not the copier. When they use someone else's concept or design, they license it, or give credit where its due. Michael Walker didn't invent the linerlock, but he invented the modern version of it. When Spyderco makes a linerlock, they credit Walker. Chris Reeve took this to another level and created the frame lock. Spyderco credits Reeve by calling their frame lock knives as having a "Reeve Integral Lock". No other company can claim this much honesty, save A.G. Russell, who IMO is the only other that gives respect and credit where it is due.
The ball bearing lock, and the AXIS lock (and many other locks) resemble each other in the way that they wedge something in the way of the blade moving. I'm not sure how Blackie Collin's lock works. I know how the AXIS lock works, and it's very different than the way the Spyderco ball lock works. I've disassembled as SOG lock on a Flash, and it was the most poorly, overly complicated design I've ever come across. Mechanically similar, yet extremely different.
That said, accusing Spyderco of copying or stealing anything is absurd, and frankly, offensive. Few, if any companies operate with the integrity and moral righteousness that Spyderco does. They have been wronged countless times, by many, but have wronged nobody. Spyderco is the company that brought both pocket clips and one-handed opening to the world of modern pocket knives. They are the innovators, not the imitators.