ASME Y14.42-2002 pdf free.ENGINEERING DRAWING AND RELATED DOCUMENTATION PRACTICES DIGITAL APPROVAL SYSTEMS.
2 REQUIREMENTS Digital approval systems shall provide for the admin- istration and digital application ofunique approval indi- cators. These systems shall be amenable to human and machine-readable protocols, provide for accurate data entry, and provide for accountability and traceability.
2.1 Approval Indicator An approval indicator, as used in this Standard, is a symbol of personal identification with the same author- ity as a manually applied signature. It shall be unique, verifiable, applicable to, controlled and applied by an individual, and affixed or hyperlinked to the approved data.
2.1.1 Composition ofan Approval Indicator. Approval indicators may consist of any symbol(s), letter(s), num- ber(s); grouping or combinations of symbol(s), letter(s), number(s); or a digital signature. Standard and com- monly used machine-readable markings (e.g., 2D bar code, matrix code, etc.) may be used as approval indi- cators. Trademarks, company logos, etc., shall not be used alone as an approval indicator. However, when com- bined with the approval indicator, such symbols provide clearassociationwitha specific organizationorfunction.
2.1.2 Approval Indicators for Engineering Data. A mechanismshallbe established and maintainedto verify and associate approval indicators to an individual. Uni- formityofapprovalindicatorplacementshould be estab- lished by company procedures, standards, or policies to enhance visibility and reduce searching. When engineering data is presented or displayed on anengineeringdrawingutilizinga drawingsheetformat in accordance with ASME Y14.1 or ASME Y14.1M, the approval indicator(s) shall be affixed, or hyperlinked, in the appropriate signature block(s).
2.1.3 Manual Drawings. Manually prepared and approved drawings and associated documents may be exempt from the requirements of this Standard. When manually prepared and approved drawings are con- verted to digital file formats, the use ofa digital approval indicator should be considered for future revisions.
2.1.4 Printouts of Digital Documents. Hard copy printouts of digital drawings shall contain dated indica- tion that the document has been approved. 2.1.5 Digital Copies of Digital Documents. When approval indicators reside in separate documents and are hyperlinked to the digital drawing, the approval indicators shall be affixed to the digital copy of the document.
2.2 Authentication and Verification of Approval Indicators Authentication applies to the validation of the approval indicator. Verification of an approval indicator applies to the validation of the approval process.
2.2.1 Authentication. A system of authentication shall be developed to ensure theaccuracyoftheapproval indicator. The authentication of an approval indicator is the process that validates the unique association of the owner of the indicator to the indicator. Methods for user authentication may be extended to provide approval indicators by combining them with cryptographic tech- niques of various kinds. Examples of technologies that have been developed for user authentication include: password systems, cryptographic systems, and biomet- rics identification methods.
2.2.2 Verification. Approval indicator verification is a process whereby all users of a document are assured that an authentic approval indicator has been used. In general, the document, the approval indicator, and other information, such as cryptographic keys or biometrics templates, may be used.ASME Y14.42 pdf download.