CERTIFIED COPY PASTE

A method comprising: receiving a user request to paste an object from a clipboard to a target application; extracting from the clipboard a signed object data block associated with the object, the signed object data block comprising a payload data block and an object format identifier, the payload data block comprising a representation of the object, the object format identifier being indicative of a format of the representation and of the presence in the signed object data block of a signature, wherein the signature is a signature of the payload data block by a source application having copied the object to the clipboard; performing a verification of the authenticity of the signature and the integrity of the payload data block using the signature; determining whether to paste or not the object to the target application based on the results of the verification.