There is no cost attached to this. The InvenTur is a free database not only for the involved services but also for the general public.
The Ministry of Tourism of the state of Yucatan often updates the INVENTUR database via visits to touristic establishments or by checking administrative registers. SEFOTUR constantly updates new Touristic services to the database. However if a Touristic service finds that they are not included within the INVENTUR, they are able to request a form to fill out and sign up. You can also ask for a member of INVENTUR to come and visit your establishment so that they can capture the necessary details via the following email address. email@example.com.
No. The Inventur is a commercial register completely independent from any other commercial, governmental or corporate database. The information displayed is sole responsibility of the Government of the State of Yucatan and those providers of touristic services included in said database However it must be noted that the information held within the InvenTur( except those considered confidential by both parties), may be used in any other database, so long as it is noted that this data was obtained via InvenTur.