Originally posted by Miguel I think your analogy falls apart with the camera market. Microsoft dominated the desktop market and was ultra-aggressive about continuing practices to reinforce that position. There is far greater choice in the DSLR market, so obvious I don't have to list the brands. The camera makers don't have to license their mounts and interfaces. They may--it may be prudent when they may later need a third party to manufacture one of their own branded lenses--but not to all third parties. From what I've read, Sigma totally reverse engineers their lens interfaces. This has created long-term compatibility issues for Canon and Nikon users for some lenses,but certainly not all. My Sigma and Tokina EOS-mount lenses work just fine.
Microsoft bundled Internet explorer with windows to shut out the third party browser companies.
Or, Microsoft cannot prohibit another software company from creating software to suit Windows, in fact Windows encourages it and facilitates it with freeware. Much like Apple applications, you can make an app and sell or give it away for free for Iphone. If you sell it Apple takes a 30% cut.
But what I meant refers to third party manufacture of any manufactured good. For instance non OEM car parts. The car manufacturers tried to stop third party manufacturers by invalidating a cars warranty if the owner used third party parts - the courts over turned this.
If the manufacturers had their way, there'd be no third party anything and we'd get gouged by them. Courts and governments want diversity in the economy.
Regarding lens mounts and pins: Pentax would have patented it, which means you cannot make it without paying for a licence from Pentax. Much like in the communist era, Fiat sold licences to the commies to allow them to make Fiat 500's 124's etc.
I've seen similar debates on Pentax forums about Chinese knockoffs such as the cheap unlicensed battery grips for sale on ebay.