Microsoft Excel stores dates as sequential serial numbers so they can be used in calculations. By default, January 1, 1900 is serial number 1, and January 1, 2008 is serial number 39448 because it is 39,448 days after January 1, 1900.
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Use the serial number you have received to convert the trial version to a full version. The serial number starts with the number 1143. You receive the serial number depending on the type of purchase:
With Mathcad 14 some licenses were not bound to the network card but to the volume serial number of your primary (usually lettered C:) harddisk. This serial number is changed every time the harddisk is formatted and of course also if you exchange the disk for a new one. Did you do something like this since Mathcad worked OK the last time?
While I never had use for that kind of programs there are free programs available which can change that number to something you like more, just search for \"hard disk serial number changer\" or something similar.
Step 7: On most Kindles, you can find this by going to Settings > All Settings > Device Options > Device Info on your Kindle. You should see information about your Kindle, including the serial number.
The next development was the paper pad system. Diplomats had long used codes and ciphers for confidentiality and to minimize telegraph costs. For the codes, words and phrases were converted to groups of numbers (typically 4 or 5 digits) using a dictionary-like codebook. For added security, secret numbers could be combined with (usually modular addition) each code group before transmission, with the secret numbers being changed periodically (this was called superencryption). In the early 1920s, three German cryptographers (Werner Kunze, Rudolf Schauffler, and Erich Langlotz), who were involved in breaking such systems, realized that they could never be broken if a separate randomly chosen additive number was used for every code group. They had duplicate paper pads printed with lines of random number groups. Each page had a serial number and eight lines. Each line had six 5-digit numbers. A page would be used as a work sheet to encode a message and then destroyed. The serial number of the page would be sent with the encoded message. The recipient would reverse the procedure and then destroy his copy of the page. The German foreign office put this system into operation by 1923.
On Calibre Kindle to PDF converter, click Preferences > Advanced > Plug-ins. Then double click File Type > DeDRM plug-in and select eInk Kindle ebooks. Enter the serial number of your Kindle on the converter.
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