The digital certificates valid for submitting a bid to a tender through the Telematic Submission of Bids or Digital Envelope functionalities of the Public Procurement Services Platform are those issued by an entity classified by Validador of AOC with a security level higher than Level 3.

Likewise, for this same type of certificate (electronic ID), it must be borne in mind that it can contain two certificates (one for signature and one for authentication). Adobe Acrobat displays both at the time of signing, however, the signature certificate will only be valid for signing the offer summary, since the authentication certificate does not have the necessary level of security.

The person signing must have powers of attorney as a representative of the company, although they can use any type of certificate. In the case of a UTE, this condition applies to the legal representatives of all companies.