Licenses which only permit non-commercial redistribution or modification of the source code for personal use only are generally not considered as open-source licenses.[1] However, open-source licenses may have some restrictions, particularly regarding the expression of respect to the origin of software, such as a requirement to preserve the name of the authors and a copyright statement within the code, or a requirement to redistribute the licensed software only under the same license (as in a copyleft license). There has previously been debates about whether open source licenses, which permit copyholders to use, transfer, and modify software, have adequate consideration, should be viewed by the courts as legally enforceable contracts.[4] While some academics have argued that open source licenses are not contracts because there is no consideration, others have argued that the significant societal value provided by the role that open source licenses play in promoting software development and improvement by facilitating access to source code offers adequate consideration.[5]