Your question is discussed here (and in some linked questions): https://opensource.stackexchange.com/questions/4012/are-licenses-irrevocable-by-default https:/

Your question is discussed here (and in some linked questions): https://opensource.stackexchange.com/questions/4012/are-licenses-irrevocable-by-default https://opensource.stackexchange.com/questions/4012/are-lice... The currently top-rated answer states: A non-exclusive copyright license (such as most FOSS licenses) can be revoked at any time only if there was no consideration involved. The United States Federal Circuit Court of Appeal took this on in Jacobsen v. Katzer[1] in 2008 and ruled that there is consideration exchanged in the use of FOSS by a licensee. This indicates that an FOSS license that's silent on revocation is likely revocable only for violation of it's conditions. But the answer may vary in other jurisdictions. Love to hear a lawyer chime in. EDIT: In the UK and EU it's also likely irrevocable once you've relied on it, eg. via principle of estoppel. The second voted answer mentions an interesting talk[2] by a panel of lawyers/experts and this starts to be discussed around the 8m 30s mark. ----- [1] https://scholar.google.com/scholar_case?case=17776182574171214893&hl=en&as_sdt=6&as_vis=1&oi=scholarr https://scholar.google.com/scholar_case?case=177761825741712... [2] https://archive.fosdem.org/2018/schedule/event/licenses_and_contracts_eu_us/ https://archive.fosdem.org/2018/schedule/event/licenses_and_...