Vladimir,
that's what it means - little experience! (I myself). I recently started, and generally something genuinely believed that all of the major sponsors of living now sold with a certificate of authenticity (well, maybe except for those that are cheaper to manufacture the certificate).
At least, we are in our start-up gallery absolutely supply of a certificate that includes a color photo, basic parameters and personal certifies the signature of the author. The second option - the signature gallerist printing company instead of a signature of the author (it has a formal right, as the work of the author bought legally, under the contract, again - with the description in the contract that the work itself).
This is a very simple operation. Or I did something misunderstood, and it is about something else.
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