Between these two extremes, there are also three categories (GNU/LGPL, permissive and copyleft) that apply to different forms of open source projects. Failure to comply with the terms of an open source license may lead to the disclosure of trade secrets or even legal action by project proponents. The four sections described above provide only a brief overview of what you can expect from a standard software license agreement. There are a few key clauses that you want to include to make sure you are well protected, no matter what may happen in the future. While it`s hard to predict anything that can happen, you can take the time to make sure you protect yourself as much as possible by including these essential clauses. Jerry Pournelle wrote in 1983: “I have not seen any evidence that… Levian agreements – full of “You must not” have any impact on piracy. He gave an example of a CLA that was impossible for a user to stick to, and he said, “Come on, guys. No one expects these agreements to be respected. Pournelle noted that, in practice, many companies were more generous to their customers than their U.S. required: “So why do they insist that their customers sign “agreements” that the customer refuses to keep and that the company knows they are not respected? … Should we continue to make hypocrites for both publishers and customers?  A software license is a legal instrument (usually in contractual law, with or without printed material) that regulates the use or transmission of software.