The notice of opposition must be signed by the person responsible, i.e. by the opponent or, where appropriate, by the representative (see also D‑IV, 1.2.1(ii), and A‑VIII, 1).[Rule 50(3); Rule 2; ]

Initials or other abbreviated forms will not be accepted as a signature.

Where the notice of opposition is filed in electronic form using the EPO Online Filing software, the signature may take the form of a facsimile signature, a text string signature or an enhanced electronic signature (see OJ EPO 2015, A91). Where it is filed using the EPO case management system (CMS), the signature may take the form of a facsimile signature or a text string signature (see OJ EPO 2015, A27).

Where the notice of opposition is filed by fax, the reproduction on the facsimile of the signature of the person filing the notice of opposition will be considered sufficient.

If the signature is omitted, the formalities officer must request the party, or where appropriate the representative, to affix their signature within a time limit to be laid down by the formalities officer. If signed in due time, the document retains its original date of receipt; otherwise it is deemed not to have been received (see D‑IV, 1.2.1(ii) and D-IV, 1.4.1).