2.3 Number of copies

The documents constituting an international application must be filed with the EPO as receiving Office in one copy only. The same applies to any of the documents referred to in the check list of the PCT request form (Box No. IX).

However, if the application is filed by fax a confirmation copy must be filed by post at the same time. See GL/PCT‑EPO A‑II, 1.2.2. As to subsequent documents filed by fax, there is no obligation to file a confirmation copy unless the receiving Office invites the applicant to submit one. See GL/PCT‑EPO A‑II, 1.3.