The invention relates to a method for securing the operation of a gadget requiring access to features hosted in a library of a gadget container (36) in order to implement these features into a primary file (35) of such gadget, the primary file (35) being sent by a Web hosting server (40) to the gadget container (36) to allow the implementation of the features with the primary file (35), wherein: —the gadget container (36) retrieves the primary file (35) of the gadget from the Web hosting server (40) with a signature (16), based on a public key/private key encryption system, associated therein,—the gadget container (36) verifies, with a public key of the public/private key encryption system, the signature (16) associated to the gadget primary file, —the gadget container (36) decides to authorize or to refuse the implementation of its library (44) features depending on whether the signature (16) associated with the primary file (35) is accepted or refused.