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Trusted timestamping is the process of securely keeping track of the creation and modification time of a document. Security here means that no one—not even the owner of the document—should be able to change it once it has been recorded provided that the timestamper's integrity is never compromised.
The Time-Stamp Protocol, or TSP is a cryptographic protocol for certifying timestamps using X.509 certificates and public key infrastructure. The timestamp is the signer's assertion that a piece of electronic data existed at or before a particular time.
The term "timestamp" derives from rubber stamps used in offices to stamp the current date, and sometimes time, in ink on paper documents, to record when the document was received. Common examples of this type of timestamp are a postmark on a letter or the "in" and "out" times on a time card .
Time Stamp Authority (TSA) - The issuer of timestamps, which can be internal to an organization or a third party or external (as in an Internet-based service). The TSA receives its provable "trusted time" from one or more reliable time sources and generates the timestamps requested from it according to the X9.95 scheme.
Yellow dots on white paper, produced by color laser printer (enlarged, dot diameter about 0.1 mm) Printer tracking dots, also known as printer steganography, DocuColor tracking dots, yellow dots, secret dots, or a machine identification code (MIC), is a digital watermark which many color laser printers and photocopiers produce on every printed page that identifies the specific device that was ...
For example, a broadcast encoder might insert a watermark every few seconds that could be used to identify the broadcast channel, program ID, and time stamp. This watermark is normally inaudible or invisible to the users, but is detectable by display devices like phones or tablets which can read the watermarks to identify the content it is ...
The metadata can be used by platforms distributing content to inform content labeling or watermarking decisions, but is not itself a visible watermark—nor is it an indelible digital signature ...
Watermarks, credits, titles, and distortions. Free images should not be watermarked, distorted, have any credits or titles in the image itself or anything else that ...