PDF glossary.
The words that come up when you add PDF editing, forms and signatures to an app — each in one plain sentence, then in a little more depth.
22 terms · last reviewed
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- Certification signatureA digital signature that certifies a PDF and sets which changes are still allowed after it: none, filling and signing forms, or annotations too.
- Cross-origin isolationA browser mode, turned on by the COOP and COEP headers, that a page needs before it can use SharedArrayBuffer and WebAssembly threads.
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- On-device processingWorking on data where it already is — on the user’s phone, computer or browser tab — instead of sending it to a server.
- Optical character recognitionOCRRecognising the text in an image — such as a scanned page — and turning it into characters that can be searched, copied or edited.
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- Package nameThe unique name of an Android app, such as com.acme.app — its identity on the device, in the Play Store and in a license key.
- PDF SDKA software development kit that adds PDF features — viewing, editing, forms, annotation, signing — to your own app, with an API and often a ready-made UI.
- PKCS #7 (CMS)CMSThe standard format for signed data used by PDF digital signatures; its current name is Cryptographic Message Syntax (CMS).
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- Self-signed certificateA certificate signed with its own key rather than by a certificate authority: it proves a document is unchanged, but not who the signer is.
- Signature verificationChecking that a PDF’s digital signature is valid, who signed it and when, and whether the document changed afterwards.