I am developing an online service (an application for Windows). I understand that I can copyright the software itself. However I would like to know my options with respect to protecting the security technique that this service will use so it cannot be immediately replicated and exploited by another party. I read about Patents however I assume I would require an international patent and there is no way I could afford this. Do you have any advice on how I could protect this product both here and overseas? It would seem that it would be very easy for someone to take what I am doing and to create a competing product.
You can't really stop anyone from copying the idea, although you can stop one from copying the material manifestation of the idea (i.e. code of your online service). So someone can create a service that (possibly) competes with yours as long as they're using their own kind of code, technique, or whatever, and then you just have to provide as much value as you can afford to be (somehow) better than the other. Good luck.
Where I'm from a 1st class international business patent runs about $1,075 U.S. This would be considered a business expense and could be claimed on your tax return. So you would get some of it back. If your idea is worth copying, then it's surely worth protecting. You may need to bite the bullet and make the investment.
You cannot stop anybody from copying you. We can use Fiverr as example. They came up with relatively unique gimmick marketplace, and were immediately copied. They spent ton of money with trademarks and it did nothing. You can Google "Fiverr alternative" and there are plenty. So how do you fight clones? You try to have a good reason for people to come to you instead of your competition. I prefer Coca Cola, some people prefer Pepsi, its capitalism, everybody makes money. People always look into trademarks, but so few look into anti-competition laws which will result in courts siding with underdog as competition is good for consumers. When you do not have decent competition you get bad quality products and stagnation.