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Most specifications are nowadays available free of charge from the ITU.

• wbl 8y ago
  Oh exciting! Link please?
  • lmz 8y ago
    https://www.itu.int/rec/T-REC-X.680 https://www.itu.int/rec/T-REC-X.680
    • pdimitar 8y ago
      Can one of you please clarify what does it mean "free" in this context? If I want my API to alternatively use ASN.1/DER instead of HTTP for encoding/decoding its traffic, are there are any licensing / copyright dangers in doing so?
      • blattimwind 8y ago
        No.
    • wbl 8y ago
      So I looked and it doesn't seem that DER is included in the free download.
      • userbinator 8y ago
        The Word documents (presumably the originals) are not free, but the PDFs are --- that link is to X.680, the general overview of ASN.1 as a whole. DER itself is in X.690 which is here: https://www.itu.int/rec/T-REC-X.690-201508-I/en https://www.itu.int/rec/T-REC-X.690-201508-I/en