As the open source has evolved over the last 3 decades, we have several different licenses and existing ones are being updated and new ones are being created, as I write. To get the best benefit out of open source, more awareness of the most popular licenses is needed. Let me assure you that you do not need to be a legal expert to understand the same. An excellent overview is available online as part of the free book "Producing open source software", by Karl Fogel. GPL is the most widely used license and it is always evolving. GPLV3 includes support for the new technlogies like web services, Digital services etc. You can read more about it on the wikipedia
I provide a simple guidance for firms based on the nature of their use of open source. Please note that I am not a legal expert and legal opinion is to be sought before making final decision.
Intent behind using Open source | Implications with regard to license |
Use open source sw internally and no intention to add/modify (eg: run a web server) | No need to worry about open source license, as all of them offer you the freedom to run the software |
Use open source in products sold | Provide a way for your customers to get the sourcecode either on a CD, ftp site etc |
Use open source in web services | Select open source with license like GPL3, which includes web services in its scope |
If you are part of a propreitary company but yet to venture deep into using open source, you need to do lot of work to work with your legal team, put process in place for regulating use of open source. It is worthwhile to pursue the same, as Open source is a reality that no company can afford to ignore.