The present invention aims to create a plurality of "access units" called "universal access unit" (11) each comprising at least one "secret code" random and single use called "access code" (8). ), to allow access to any "transmitting platform" (1a) (1b) (1c) (1d) and to make its content accessible. The device of the invention comprises a unit of value (11) called "universal access unit" (11) consisting of a support carrying at least one "secret code" called "access code" for single use (8). ). The user (9) having a "universal access unit" (11) chooses a "transmitting platform" (1c), enters on his equipment (6) the "access code" for single use (8) through the link (7). The "transmitting platform" (1c) queries by the "platform link" (4) a "comparator" (3), which checks whether the "user access code" (8) entered by the user (9) is well on the list of "access codes" (8) available in a creation unit and storage of "access code" (8) said "stock codes" (2). It allows or not the "sending platform" (1c) to open access to its content. After each authorization, the "comparator" (3) eliminates each "access code" (8) used and increments the account of the "issuing platform" concerned. Periodically, the "comparator" (3) counts the account of each "issuing platform" (1a) (1b) (1c) (1d).
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