@oldsysops Yes and No: "The CryptPad Document, Presentation & Spreadsheet applications are an OnlyOffice Docs integration. However, this only concerns the client-side code, CryptPad does not make use of the OnlyOffice Document Server. CryptPad's encrypted collaboration, used for document, presentantion & spreadsheets and other applications, is completely different from the encryption system used in parts of upstream OnlyOffice."

https://docs.cryptpad.org/en/FAQ.html#faq-oointegration