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DWG (from drawing) is a proprietary [3] binary file format used for storing two- and three- dimensional design data and metadata.It is the native format for several CAD packages including DraftSight, AutoCAD, ZWCAD, IntelliCAD (and its variants), Caddie and Open Design Alliance compliant applications.
PGP is used for signing, encrypting, and decrypting texts, e-mails, files, directories, and whole disk partitions and to increase the security of e-mail communications. Phil Zimmermann developed PGP in 1991. [4] PGP and similar software follow the OpenPGP standard (RFC 4880), an open standard for encrypting and decrypting data.
Other formats possibly not yet written: STEP - international standard for product data exchange (); G - BRL-CAD standard solid modeling open format including support for primitives, attributes, and arbitrary data storage
AutoCAD opens documents with DWG compatibility as a "DWG file format version code" where the specific version code can be found by opening the .dwg file in Windows Notepad or any text editor program. The file contents starts with this string. The file format version code (tag) is dependent on the AutoCAD version. [2]
In PGP, normal users can issue certificates to each other, forming a web of trust, and fingerprints are often used to assist in this process (e.g., at key-signing parties). In systems such as CGA or SFS and most cryptographic peer-to-peer networks , fingerprints are embedded into pre-existing address and name formats (such as IPv6 addresses ...
And to really trust a specific PGP/GPG key, users would need to physically meet with every specific original author or developer, or users would need to physically meet with the original-releaser of file-signing pub-key, or, users would need to find another alternative trustworthy user, who is in trusted-chain of WOT (aka, another user or ...
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